What was found
LAX - FLT 123 - EN ROUTE DFW/HNL, DURING CRUISE, FIRE WARNING ON NR 3 ENGINE. ACCOMPLISHED SHUTDOWN OF NR 3 ENGINE AND DISCHARGED BOTH FIRE BOTTLES. AIRCRAFT DIVERTED TO LAX AND LANDED WITHOUT INCIDENT. REPLACED BOTH FIRE EXTINGUISHER BOTTLES ON NR 3 ENGINE. RESECURED HIGH STAGE BLEED DUCT ON RT SIDE OF ENGINE AT Y DUCT. REPLACED PNEUMATIC DUCT UNDER ENGINE STANDOFF BRACKET AND STANDOFF BRACKET ROD END. REPLACED HEAT SHIELDS FROM B SUMP VENT LINE. REPLACED FAN AIR WIRES. REPLACED NR 3 ENGINE FIRE DETECTOR LOOPS A AND B FOR FAN AND PYLON. ACCOMPLISHED LEAK CHECK AND GROUND ENGINE RUN WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)