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Missing GC SRV record for DNS server

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On my DC server "BranchDC1" (Server 2008 R2 Core), I am getting the following error:

\>dcdiag /test:dns /e
 DC: BRANCHDC1.mydomain.com
 Domain: mydomain.com
    TEST: Records registration (RReg)
       Network Adapter [00000000] Microsoft Virtual Machine Bus Network Adapter:
          Warning:
          Missing SRV record at DNS server 10.2.100.121:
          _ldap._tcp.gc._msdcs.mydomain.com
    Error: Record registrations cannot be found for all the network adapters

My other branch office DCs do not throw this error. The IP address shown above is for BranchDC1's replication partner in the data center, "HQDC1."

BranchDC1 was just re-added to the domain and re-promoted, after being demoted and removed for a few weeks while the branch office was being relocated.

I've been checking everything I can think of. And the only thing I can find wrong is that HQDC1 is missing the _ldap SRV record for BranchDC1 under Forward Lookup Zones/mydomain.com/_msdcs/gc/_sites/BranchDC1/_tcp. It is present in this location on BranchDC1. Other DCs are missing it, too, but they all replicate with HQDC1, and it only throws the error for this one.  

Under NTDS Settings Properties for the BranchDC1 server in AD Sites and Services, Global Catalog is checked.

I removed BranchDC1 as a GC in Sites and Services. I deleted the _ldap SRV for BranchDC1 from under BranchDC1/Forward Lookup Zones/mydomain.com/_msdcs/gc/_tcp (this record is missing from this location on other DCs). Verified its site folder disappeared from /_msdcs/gc/_sites. Then I re-enabled it as a GC. Things wen back to the way they were... The SRV record reappeared, but still only on BranchDC1. The site folder got recreated on all DCs, although under /_msdcs/gc/_sites/BranchDC1/_tcp it shows a ldap SRV record for BranchDC1 and HQDC2 (another DC at the data center). No other site shows a record for anything but itself in that location.

I tried nltest /dsregdns.
I have tried registerdns, stop/start netlogon. I swapped order of DNS servers on BranchDC1's NIC (pointing to itself and HQDC1), and performed those steps again.
I checked netlogon.dns on BranchDC1 and it looks right (compared it to others). No other SRV records appear to be missing from anywhere else that I've found thus far.
Replication looks good.

Doing dcdiag /fix passes all tests.

dcdiag /test:replications /e shows no errors.
repadmin /showrepl hqdc1.mydomain.com shows no errors. 
repadmin /replsum shows no fails.

Ran the AD Replication Status too. No errors with replication. Branch DC1 is recognized as a GC.

In the event log, there isn't much. There is an event ID 5781, but that's from the other day when I was first bringing the system back. And there were a couple recent event ID 1014, for mydomain.com. 


How can I get it to auto-generate this record?

Thanks in advance for your help.

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