Regula expressions: How to find a string without some other string

Hi,
I have a log file with several text OK and error messages.

OK message is always: AAA000A

Error message starts with AAA, then three numbers (but not three zeros) and letter A.
Error sample: AAA001A

From the Vim Regular Expression web site:
http://vimregex.com/#metacharacters
I can see:
\d digit
\D non-digit

To find OK and error message in vim:
/AAA\d\d\d\D

but how to get only error messages.

Something like:
- use: /AAA\d\d\d\D
- except: /AAA000A

Regards

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