Check out this great list of TMG log event IDs. They will pulled from event information in the SCOM Management Pack 7.0.
http://blogs.technet.com/b/isablog/archive/2012/04/18/tmg-event-log-ids.aspx
HTH,
Deb
DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)
“MS SECURITY”
[email protected]