As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA-ON FLIGHT NUMBER 2312, INFLIGHT AFT CARGO DOOR WARNING LIGHT CAME ON, AIRCRAFT RETURNED TO FIELD. INSPECTED CARGO DOOR. FOUND DOOR HANDLE NOT STOWED "POPPED OUT" CYCLED DOOR AND HANDLE SEVERAL TIMES. DOOR AND HANDLE OPERATE NORMALLY. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.