What was found
AFTER TAKEOFF, NR 1 ENGINE HAD A FIRE WARNING SHUTDOWN ENGINE AS PER AOM DISCHARGED ONE FIRE BOTTLE, LIGHT WENT OUT. ON POST FLIGHT, FOUND HEAT DAMAGE TO BOTH COWLS, AFT FIRE LOOP, AND AFT WIRING HARNESS. DETERMINED ACFT WILL DO 3 ENGINE FERRY. NR 1 ENGINE PREPARED FOR FERRY FLIGHT IAW BOEING B747 MM 71-00-61 N1 FAN STRAPPED, N2 LOCK-OUT INSTALLED, REVERSER BOLTED IN STOWED POSITION. COMPLIED WITH FORM M-29A PREP FOR FERRY FLIGHT. AIRCRAFT INSPECTED AND FOUND TO BE SAFE FOR INTENDED FERRY FLIGHT. REMOVED AND REPLACED NR 1 ENGINE IAW 71-00-00 AND AIA 7EC7100 OPS AND LEAK CHECK GOOD. PRELIMINARY TEARDOWN FINDINGS: NR 3 BEARING AREA OIL COKING AND FOUND TURBINE DAMAGE.