That pesky SQL Server 2005 error
http://www.corkchop.com/journal/2007/3/28/error-18456-severity-14-state-16.html
http://www.virtual-generations.com/2007/01/28/sharepoint-and-sql-server-error-18456/
In my case, I had to delete the SQL Server Agent job in SQL Server Management Studio
Tags: event id, moss, sharepoint, sql server 2005
[...] Failure Audit for Cluster Service Account: Receive the following Event in the Application Log of the test and production SQL 2005 cluster. It turns out the SharePoint install left some old timer jobs. Once those jobs were deleted, the failure audit is gone. Thanks to http://roadburn.audioreload.com/2007/11/29/error-18456-severity-14-state-16/. [...]