What was found
MIA - FLT 901 - AFTER TAKEOFF MIA DURING CLIMB-OUT, NR 1 ENGINE FIRE WARNING WITH NO SUPPORTING INDICATIONS. AIRCRAFT RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED CAWS COMPUTER AND NR 1 ENGINE FDCU AND WARNING PERSISTED. AIRCRAFT MAINTENANCE FERRY MIA/DFW. REPLACED NR 1 ENGINE 'A' AND 'B' LOOP FIRE DETECTOR WARNING ELEMENTS AND HARNESSES. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)