What was found
FLT 5989 - MBS-PIT - EN ROUTE FROM SAGINAW TO PIT, PILOT REPORTED THE PAX DOOR ANNUNC ILLUMINATED. CREW DECLARED AN EMERGENCY AND DIVERTED TO DTW. THE DOOR WAS INSPECTED TO INSURE THAT IT WAS PROPERLY CLOSED AND LOCKED. MAINTENANCE ACTION WAS DEFERRED ON THE ANNUNC PER MEL 52-01. AIRCRAFT WAS RETURNED TO SERVICE. IN SUBSEQUENT MAINTENANCE, THE DOOR AJAR SWITCH WAS ADJUSTED AS NEEDED, OPS CHECK GOOD. (M)