Hi,
I recently upgraded our domain from 2008 to 2016 however I had some issues with replication on the Sysvol. Initially it was ACL which I found out where related to a duplicated "Domain Admins" created when upgraded. I have resolved that but now on the PDC (holding the PDC, RID and Infrastructure master roles) it is showing the "modification date" is different from the "Basline" which is showing a date from two years ago. However another of the DC's is showing the replication is fine between them.
DCDiag Error:
A warning event occurred. EventID: 0x00000087
Repladmin:
No Errors - Successfully in Sync
Dfsdiag /testdcs:
No Errors