As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- AFT BAGGAGE DOOR WARNING LIGHT ILLUMINATED AT TAKEOFF AND REMAINED ON MORE THAN OFF DURING BRIEF UNPRESSURIZED FLIGHT. AIRCRAFT RETURNED TO FIELD WITHOUT INCIDENT. INTERROGATED PSEU FOR FAULT CODES AND INSPECTED SENSOR. FOUND SENSOR FACE AND TARGET TO BE DIRTY. CLEANED AND LUBED. GROUND RAN, NO FAULT INDICATIONS OR WARNINGS NOTED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.