Just a reminder for myself how to do it really.
I’ll deal with the SYSVOL replication issues first, then move onto the DCOM issues.
They were getting;
I checked the usual, and both DC01 and DC02 could talk ok, so I figured “Let’s just Resync the bugger”.
http://support.microsoft.com/kb/290762
The above MS KB will tell you in detail, however here is a overlay for replacing DC02 with DC01’s copy (making DC01 Authoritative)
Stop the File Replication Service on both DC01 and DC02
Edit the registry on both;
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NtFrs\Parameters\Backup/Restore\Process at Startup
On DC01 I set it to D4 –> AKA Authoritative. On DC02 I set it to D2 –> AKA non-authoritative.
Start the FRS on DC01 and let it clear through the normal event log messages (right up to where it proclaims it is OK to be a DC again! Thank god!), then start up DC02. Monitor, and voila it all synced!
Jobs a goodun’ guvnor 
