As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AIRCRAFT RETURNED TO FIELD WHEN AFT CARGO DOOR WARNING ILLLUMINATED. MAINTENANCE INSPECTED THE AFT CARGO DOOR AND FOUND THE HANDLE STANDOFFS WORN. HANDLE WAS REPLACED AND OPERATIONAL CHECK WAS PERFORMED. OPERATIONAL CHECK WAS GOOD. AIRCRAFT RETURNED TO SERVICE.