As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED BAG SMOKE DETECTOR LIGHT AT 10,000' ON DEPARTURE. THE CREW DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE WHERE THE ACFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE ACFT AND FOUND NO EVIDENCE OF SMOKE, OPERATIONALLY TESTED THE BAG SMOKE DETECTORS WITH NO DEFECTS NOTED, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.