As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - CARGO DOOR WARNING LIGHT ILLUMINATED IN-FLIGHT. AIRCRAFT RETURNED TO STATION WITHOUT INCIDENT. MAINTENANCE DEFERRED DOOR WARNING SYSTEM PER MEL 52-70-1. AIRCRAFT RETURNED TO SERVICE. MAINTENANCE SUBSEQUENTLY REPLACED AFT CARGO DOOR MICROSWITCH BRACKETS. OPERATIONAL CHECK OF CARGO DOOR INDICATION SYSTEM NORMAL. (X)