As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUL- ON FLIGHT 4331, THE AFT CARGO DOOR MASTER CAUTION ILLUMINATED ALONG WITH A PROX SYSTEM 2 FAULT MESSAGE. AIRCRAFT RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE FOUND THE CARGO DOOR HANDLE NOT STOWED. RESECURED HANDLE AND OPERATED DOOR PER AMM TASK 52-31-03-710-801-A01. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.