What was found
BGR - FLT 4277 - AFTER TAKEOFF, THE CREW RECEIVED A CARGO COMPARTMENT SMOKE WARNING. THE WARNING LIGHT EXTINGUISHED AND THEN ILLUMINATED AGAIN. CREW FOLLOWED PROCEDURES AND DISCHARGED THE EXTINGUISHER BOTTLE. AIRCRAFT RETURNED TO BGR AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NO EVIDENCE OF SMOKE OR FIRE. BOTH SMOKE DETECTORS WERE REPLACED ALONG WITH THE EXTINGUISHER BOTTLE. SYSTEM TESTED GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (M)