I had a same issue months ago, but now again:
For some reason we have SQL 7 with sp2 running on NT 4 SP6.
Our sql server log records all kinds alert(Replication:Agent success) created errors: error 14150,severity 10, state 1 whenever any replication agent has some activity and reports "successful message". I go to EM-SQL Server Agent-Alerts, disabled this alert, but errors still showing in SQL log for months. How to get rid of this alert? Thank you for your idea.