Check the online help.
7.4.2 has these in the doc for AVs:
14000 AVError Error in AntivirusFilter: $reason$.
14001 AVScanFailedFull Cannot call McAfee Gateway Anti-Malware engine. All connections in use.
14002 AVError Internal error in Anti-Malware filter.
14003 AVError Timeout occurred while filtering.
14004 AVError Cannot filter because a special update is performed.
14005 AVError Scanning failed.