What was found
RECEIVED NR 1 ENGINE FIRE INDICATION ON FINAL APPROACH WITH POWER AT IDLE. SYS TESTED OK & ENGINE WAS SHUTDOWN AND BOTTLE DISCHARGED IAW CHECKLIST. FIRE WARNING SYS STILL DID NOT SILENCE UNTIL ON THE GROUND & NR 1 ENGINE DET "B" CB PULLED. EMERGENCY VEHICLES CONFIRMED NO SIGN OF FIRE. *(NO OTHER INDICATIONS OF FIRE WERE RECOGNIZED.) R & R NR1 ENG PYLON FIRE DETECTION LOOP ASSY IAW AMM 26-11-012-4-0. OPS CHECKS GOOD. R & R ENGINE FIRE DETECTION CONTROLLER IAW MM 26-11-000-4. OP'S CHECK OK. RAN ENG IAW OP'S CHECK OK. NO LEAKS NOTED.