What was found
LEVEL 1, FIRE DETECTION 1 FAIL APPROX 5 MINUTES AFTER TAKEOFF FOLLOWED BY INTERMITTENT ENGINE 1 FIRE WARNING (ENGINE OPERATING INDICATIONS WERE NORMAL). ALL INDICATIONS STOPPED UNTIL FINAL APPROACH, AT WHICH TIME HAD INTERMITTENT LEVEL 1, FIRE DETECT 1, FAIL. R & R FIRE DETECTOR HARNESS, LOOP A, ON ENG 1 REF AMM 71-50-04-4-1. BITE TESTED GOOD. GEARBOX LOOP A(DH6) AND UPPER TURB R LOOP A (DH4)REF ESM 71-00-02. RAN ENG IAW JRH TO 83 PERCENT. NO FAULTS NOTED. OK FOR SERVICE.