As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX ON FLIGHT 2309- AFT CARGO DOOR UNSAFE IN FLIGHT. AIRCRAFT RETURNED TO FIELD. AIRCRAFT LANDED WITHOUT INCIDENT. FOUND AFT CARGO DOOR HANDLE OUT OF LOCKED POSITION. CLEANED AND LUBED HANDLE SHAFT. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.