As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE FROM MEM TO BHM A SMOKE WARNING LIGHT ILLUMINATED. THERE WAS NO SMOKE PRESENT. THE CREW DECLARED AN EMERGENCY AND RETURNED TO MEM. A SMOKE DETECTOR WAS REMOVED AND REPLACED AND THE SYSTEM CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.