What was found
LT ENGINE FIRE LIGHT CAME ON FOR A FEW SECONDS. AFTER REDUCTION OF POWER, LIGHT EXTINGUISHED. NO OTHER INDICATIONS OF A FIRE. INSPECTED FIRE HARNESS LOOPS WITH NO DEFECTS NOTED. COMPLIED WITH FIRE LOOP RESISTANCE CHECKS IAW MFG MM AND FOUND WITHIN LIMITS. FIRE LOOP TEST, OK. AIRCRAFT GROUND RUN AND COULD NOT DUPLICATE. REPLACED HP SECTION OF MOD VALVE CRUSH GASKET DUE TO MINOR AIR LEAK. THIS WAS NOT BELIEVED TO CAUSE THE PROBLEM.