As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ACFT WOULD NOT PRESSURIZE AFTER TAKEOFF. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND AFT CARGO DOOR NOT PROPERLY CLOSED. MAINTENANCE CLOSED AFT CARGO DOOR AND PERFORMED CHECKS IAW AMM. NO DEFECTS NOTED. ACFT RELEASED FOR SERVICE.