As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDT-PHL FLIGHT#3734. CREW REPORTED BAG BAY SMOKE DETECTOR ILLUMINTAED INTERMITTANTLY IN FLIGHT. EMERGENCY WAS DECLARED, AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND #1 SMOKE DETECTOR AT FAULT. #1 SMOKE DETECTOR REPLACED IN ACCORDANCE WITH MAINTENANCE MANUAL CHAPTER 26-12-00. AIRCRAFT RETURNED TO SERVICE.