"where can l locate the right job that triggered the failed password attempts."
Are you referring to the BO user login failure from Audit record? You can find Event_Type_ID= 65539 and Event_Type_Description="User logon failed". See page 631 of BusinessObjects Enterprise 3.1 Administrator's Guide.
Or, are you looking for the report scheduled jobs whose database login credential is incorrect/expired?
Regards,
Jin-Chong