As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2312 - AIRCRAFT RETURNED TO FIELD WHEN AFTER TAKEOFF THE CREW RECEIVED A MAIN BAGGAGE DOOR LIGHT. MAINTENANCE INSPECTED AND FOUND THE AFT BAGGAGE DOOR HANDLE RELEASE LOCK NOT FULLY ENGAGED. A FUNCTIONAL CHECK OF THE AFT BAGGAGE DOOR CHECKED GOOD. THE LOCK RELEASE AND HANDLE WAS VERIFIED TO OPERATE PROPERLY. THE AIRCRAFT WAS RETURNED TO SERVICE.