As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1738- DURING CRUISE OPERATION THE MAIN CARGO DOOR RED LIGHT ILLUMINATED, ON BULKHEAD BOTH VENT DOOR AND HOOK UNLOCKED LIGHTS WERE ILLUMINATED. POST FLIGHT INSPECTION WAS PERFORMED. CLEANED AND LUBRICATED DOOR LATCHES AND SWITCHES. OPERATIONAL AND PRESSURIZATION CHECKS OF THE MAIN DOOR WERE ACCOMPLISHED. NO DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.