DCDIAG Error



Sometimes Exchange 2007 had problem connecting to the DC (cannot find DC) I
then started to run a dcdiag and got some DNS errors which I think I fixed.
Now when I run a DCdiag it passes all the test without one of which I have
attached the log from DCDIAG below. I have no idea what that could be.
Could anyone please point me to the right direction. I really would
appreciate.

Thanks in advance.

Starting test: frsevent
......................... SCTDC passed test frsevent
Starting test: kccevent
An Error Event occured. EventID: 0x0000025C
Time Generated: 08/18/2008 11:03:20
Event String: NTDS (476) NTDSA: Locale ID 0x0000041e (Thai
......................... SCTDC failed test kccevent
Starting test: systemlog
An Error Event occured. EventID: 0x00000457
Time Generated: 08/18/2008 11:02:39
(Event String could not be retrieved)
An Error Event occured. EventID: 0x00000457
Time Generated: 08/18/2008 11:02:39
(Event String could not be retrieved)
An Error Event occured. EventID: 0x00000457
Time Generated: 08/18/2008 11:02:39
(Event String could not be retrieved)
......................... SCTDC failed test systemlog
.