As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED CARGO DOOR MESSAGE IN FLIGHT. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. AFTER LANDING, DOOR HANDLE WAS REPORTED AS POPPED OUT. MAINTENANCE CLEANED AND INSPECTED CARGO DOOR LATCH AND PERFORMED CHECKS IAW AMM. NO DEFECTS NOTED. ACFT RELEASED FOR SERVICE.