What was found
DURING INITIAL DESCENT, FLIGHT CREW RECEIVED 'FIRE WARNING' INDICATION ON NR 1 ENGINE. FLIGHT CREW PERFORMED ABNORMAL PROCEDURES: SHUT DOWN NR 1 ENGINE, DISCHARGED NR 1 FIRE BOTTLE. AT THAT TIME, FIRE WARNING INDICATION EXTINGUISHED. ACFT LANDED WITHOUT FURTHER INCIDENT. ACFT WAS INSPECTED, AND NO EVIDENCE OF FIRE NOTED. CFDS REVIEWED AND NR 1 ENG A-LOOP WITH B-LOOP INOP WOULD CAUSE 'FIRE WARNING' INDICATION. REPLACED 'A' RT REVERSER COWL FIRE LOOP, CLEARING FAULT ON A-LOOP. ADDITIONALLY, CLEARED FAULTS ON B-LOOP BY REPLACING RT REVERSER COWL LOOP AND B-LOOP PYLON HARNESS. BOTH SYSTEMS OPS CHK NORMAL DURING GROUND RUNS. ACFT RETURNED TO SERVICE. (X)