ActiveDirectory_DomainService EventID 1481 Error

Question

Dear All,
First of all: please apologize my weak English
I had a few strange warnings on internal processing yesterday in the directory service Eventlog on a RODC (2K8) in our branch office. After some head scratching, I decided
to run a integrity check on the ntds.dit - furthermore I've compacted the Database on the RODC - even knowing, there is an automatic process for that. At the end: no luck at all! - Long story short answer: I demoted the RODC.
To gain more information on the health state of the directory partitions, I turned on verbose loging for internal processing (log Level 5). In this mode I received many occurrences
of the following errors:
Log Name:      Directory Service
Source:        Microsoft-Windows-ActiveDirectory_DomainService
Date:          12.06.2014 14:13:14
Event ID:      1481
Task Category: Internal Processing
Level:         Error
Keywords:      Classic
User:          ANONYMOUS LOGON
Computer:      dc1.domainB.lan
Description:
Internal error: The operation on the object failed.
Additional Data
Error value:
2 000020EF: NameErr: DSID-03250105, problem 2001 (NO_OBJECT), data -1603, best match of:
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-ActiveDirectory_DomainService" Guid="{0e8478c5-3605-4e8c-8497-1e730c959516}" EventSourceName="NTDS General" />
    <EventID Qualifiers="49152">1481</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>9</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime="2014-06-12T12:13:14.863Z" />
    <EventRecordID>608185</EventRecordID>
    <Correlation />
    <Execution ProcessID="616" ThreadID="4696" />
    <Channel>Directory Service</Channel>
    <Computer>dc1.domainB.lan</Computer>
    <Security UserID="S-1-5-7" />
  </System>
  <EventData>
    <Data>000020EF: NameErr: DSID-03250105, problem 2001 (NO_OBJECT), data -1603, best match of:
</Data>
    <Data>2</Data>
  </EventData>
</Event>
and
Log Name:      Directory Service
Source:        Microsoft-Windows-ActiveDirectory_DomainService
Date:          12.06.2014 14:13:07
Event ID:      1481
Task Category: Internal Processing
Level:         Error
Keywords:      Classic
User:          ANONYMOUS LOGON
Computer:      dc1.domainB.lan
Description:
Internal error: The operation on the object failed.
Additional Data
Error value:
1 00002074: AtrErr: DSID-03120527, #1:
    0: 00002074: DSID-03120527, problem 1001 (NO_ATTRIBUTE_OR_VAL), data 0, Att 90204 (serverReferenceBL)
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-ActiveDirectory_DomainService" Guid="{0e8478c5-3605-4e8c-8497-1e730c959516}" EventSourceName="NTDS General" />
    <EventID Qualifiers="49152">1481</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>9</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime="2014-06-12T12:13:07.534Z" />
    <EventRecordID>608174</EventRecordID>
    <Correlation />
    <Execution ProcessID="616" ThreadID="5276" />
    <Channel>Directory Service</Channel>
    <Computer>dc1.domainB.lan</Computer>
    <Security UserID="S-1-5-7" />
  </System>
  <EventData>
    <Data>00002074: AtrErr: DSID-03120527, #1:
    0: 00002074: DSID-03120527, problem 1001 (NO_ATTRIBUTE_OR_VAL), data 0, Att 90204 (serverReferenceBL)
</Data>
    <Data>1</Data>
  </EventData>
</Event>
These errors are only displayed while verbose (debug) logging on "Internal Processing" and we have no known Issue with our ADDS Forest. But now I'm:
a) little bit concerned
b) Curious what's going on (I already know what the DSIS-%nr% represents and that object or attribute of objects were not found.
I'm just asking for your professional advice or help if needed, as I don't  have much experience with this kind of errors.
kind regards
Basil
MCITP Enterprise Admin
MCSA Windows Server 2012
And some other stuff....

Answer 1

It could be (for example) a DC was promoted for a new DC in the forest and either the promote failed or the DC was removed before the global catalog was converged.  Using this example, there would still be an object for this domain in the Configuration
NC yet to be cleaned up.  With no other events to go on that would indicate this - or any other - root cause of the situation it's almost impossible to tell.
If you're really adamant about clearing this event, you could do a semantic database analysis on one of the DC's to see if that fixes it.
http://technet.microsoft.com/en-us/library/cc816754(v=WS.10).aspx
Otherwise I'd keep monitoring the DS logs to see if additional errors crop up indicating a problem. For now it sounds like the forest is probably ok.  There might just be some "junk" in the database, but not likely a corruption.