First off, yes, I just found where Veritas denies support for 8.6 with 2003.
Secondly, yes, I can attach with the local backup account to any of the servers, including Enterprise Manager and browse all databases, make changes to them, add users, delete users, make changes to databases, etc.
Also, after upgrading my 8.6 to the 3878 patch, I can no longer backup individual files or directires as I could before. I now get the Item cannot be found when I try to backup anything at all, except frome the local media server.