What was found
SHV - FLIGHT NUMBER 4921 FROM LFT TO SHV WITH TAKEOFF THRUST ON TAKEOFF ROLL ENGINE NR 1 FIRE DET FAIL MESSAGE PRESENTED ON EICAS. NO OTHER INDICATIONS AND MESSAGE WENT AWAY WITH THROTTLE REDUCTION. MAINTENANCE VISUALLY INSPECTED FIRE LOOP AND VISUALLY INSPECTED ENGINE NR 1 FOR EVIDENCE OF FIRE; NO EVIDENCE NOTED. AIRCRAFT WAS THEN RELEASED FOR FERRY FLIGHT FROM LFT TO SHV FOR FURTHER MAINTENANCE. MAINTENANCE IN SHV REMOVED AND REPLACED ENGINE 1 FIRE DETECTOR IAW EMB-145 AMM 26-11-01, OPS CHECK GOOD. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.