What was found
KDAY- ENGINE FIRE ON TAKEOFF, BOTH BOTTLES DISCHARGED, LIGHT WENT OUT 5 MINUTES AFTER 2ND DISCHARGED. MX INSPECTED NR 4 ENGINE FOUND NO EVIDENCE OF FIRE, NO PNEUMATIC LEAKS DETECTED ON GROUND POWER RUN. COULD NOT DUPLICATE. FOR PRECAUTIONARY REMOVED AND REPLACED ALL THREE FIRE LOOPS ON NR 4 ENGINE, LOWER AND BOTH UPPER. ALL CHECK GOOD, ENGINE CHECK GOOD. (M)