I have found and went through this: 2 new DC not replicating. EVENT 13508 - NtFrs (microsoft.com), but I don't know if a D2/D4 is what I need here.  I have reviewed this as well: Use BurFlags to reinitialize File Replication Service (FRS) - Windows Server | Microsoft Docs.  In this it doesn't specify which DC I set the flag on.  I assume PDC, but either way from the bottom of the document this isn't going to fix my root cause issue.

Two weeks ago our host went down for DC1.  Since DC1, and DC2 are not replicating to one another.  It is currently FRS.  I discovered this while looking in to migrating to DFS.

"If you configure an FRS member to complete an authoritative or nonauthoritative restore by using the BurFlags registry subkey, you don't resolve the issues that initially caused the replication problem."

Brass has a lower melting point at around 900c so no way the oven is ever going to hurt that. Not sure about expansion, although it looks like youve tried it and it didnt work. If you can find a way to hit the cover hard with something from the outside face, that might shock it loose. May need to be careful depending on how thin the material is there, im assuming its fairly beefy because they wanted them to be heavy. Ive seen people using bent screwdrivers before to great effect, theres also another awesome little tip you can try. If you get some grease, some kitchen towel, and something which fits in that inner bearing hole really tightly you can use the pressure of the grease to remove it. If you pack the grease in the hole where the shaft is supposed to sit with some kitchen towel, then take a shaft which fits tightly and hit it, you can create enough pressure that it will force the bearing out as the grease cant compress. Video link here, this might work;

@JensI use the weighted Fastrax ones, they are well make and available in the UK - just a bit more expensive than the Chinese ones

Looks like a portal cover for the trx4 in your sig, if metal put in the oven for a bit as others have suggested, or if not i find that you can put the shaft tip into the bearing and wiggle and it should pop free.

https://www.modelsport.co.uk/index.php?product_id=424517&gclid=Cj0KCQiAwMP9BRCzARIsAPWTJ_Eg-6E_bjv5dDHCSGLQJoKdKLmzTBHHswOZRxuFrG6XQVKGv1zWq14aAnGjEALw_wcB

I just tried the oven method fearing that something goes wrong. But at the end nothing happened. Bearings also didn't come out.

So far I have searched everywhere but the smallest inner bearing puller I could find pulls only those with an inner diameter of 8mm.

My idea would be drop one the right size in, use a threaded bar with 2 nuts locked so that you have enough thread left on the end to get a slide hammer on and just slide hammer it out... I guess you could end up doing the same as what you've done by pulling the innards out though...

Hi. I'm going to assume it's a metal cover. Try putting it in the oven 200°c for 5-10  minutes or a heat gun then normally they will fall out on their own.

Hi. I'm going to assume it's a metal cover. Try putting it in the oven 200°c for 5-10  minutes or a heat gun then normally they will fall out on their own.

Try Newton's third law, every force has an equal and opposite reactionary force thingy. Tap the rim of the housing, not to hard but repeatedly and the bearing should slowly raise out of the housing. Seriously, it does work.

Side question as well, how can I initiate/force an FRS sync?  The log shows the failures once daily, 25 hours apart (one hour later each day) since the host went down, so I assumed it was a scheduled task, but I couldn't find anything in taskschd or a schedule option via ntfrsutl.

Looks like a portal cover for the trx4 in your sig, if metal put in the oven for a bit as others have suggested, or if not i find that you can put the shaft tip into the bearing and wiggle and it should pop free.

I can ping from each device, and outputs for troubleshooting is below.  I have confirmed ports for RPC are open and they can talk to one another over the network on 135.  Services on both DCs are running as well.

Brass has a lower melting point at around 900c so no way the oven is ever going to hurt that. Not sure about expansion, although it looks like youve tried it and it didnt work. If you can find a way to hit the cover hard with something from the outside face, that might shock it loose. May need to be careful depending on how thin the material is there, im assuming its fairly beefy because they wanted them to be heavy. Ive seen people using bent screwdrivers before to great effect, theres also another awesome little tip you can try. If you get some grease, some kitchen towel, and something which fits in that inner bearing hole really tightly you can use the pressure of the grease to remove it. If you pack the grease in the hole where the shaft is supposed to sit with some kitchen towel, then take a shaft which fits tightly and hit it, you can create enough pressure that it will force the bearing out as the grease cant compress. Video link here, this might work;

Try Newton's third law, every force has an equal and opposite reactionary force thingy. Tap the rim of the housing, not to hard but repeatedly and the bearing should slowly raise out of the housing. Seriously, it does work.

@JensI use the weighted Fastrax ones, they are well make and available in the UK - just a bit more expensive than the Chinese ones

Got a tiny flat blade screwdriver.  Hest it up. Bend the tip over to 90% then tap it under the bearing.  Moving it around the bearing hit by bit.  Will pop it out no trouble. Its how i do it with tiny tricky ones

@JensI use the weighted Fastrax ones, they are well make and available in the UK - just a bit more expensive than the Chinese ones

https://www.modelsport.co.uk/index.php?product_id=424517&gclid=Cj0KCQiAwMP9BRCzARIsAPWTJ_Eg-6E_bjv5dDHCSGLQJoKdKLmzTBHHswOZRxuFrG6XQVKGv1zWq14aAnGjEALw_wcB

https://www.modelsport.co.uk/index.php?product_id=424517&gclid=Cj0KCQiAwMP9BRCzARIsAPWTJ_Eg-6E_bjv5dDHCSGLQJoKdKLmzTBHHswOZRxuFrG6XQVKGv1zWq14aAnGjEALw_wcB