No SYSVOL & NETLOGON on a DC (FRS is broken)

Need some help on the subjcet.

On one of the DCs, FRS is not working...

Have tried D4/D2 (Auth/non-auth) restore to no avail.

NtFrs logs amongst others: 

- ERROR - Invalid Partner: AuthClient:domain name\dcname$

- DS: ERROR - Can't free system member DCname:  Ldap Status: Insufficient Rights

- DS: Marking connection inconsistent

I can also see that the there is no GUID in the Cumulative Replica Sets/Replica Sets in the registry of the affected DC...

I have tried to recreate the missing objects (CN=NTFRS Subscriptions etc.) using ADSIEEDIT but getting the GUID baclk in the registry is the issue..

D2 is not working because no GUID set for Cumulative Replica Sets/Replica Sets.

Any help/advice on resolving this would be appreciated.

NOTE:

DC is Windows 2012 R2, SYSVOL still uses FRS. When this is resolved and no issues with all DCs, FRS would be migrated to DFSR...

Please help.

Thanks.