As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2335 - AIRCRAFT RETURNED TO FIELD WHEN AFTER TAKEOFF THE CREW RECEIVED A REAR BAGGAGE DOOR WARNING. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE BAG DOOR HANDLE UNSECURE. MAINTENANCE SECURED THE HANDLE AND PERFORMED OPERATIONAL CHECKS. THE CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.