What was found
PILOT REPORT IN FMR - #1 ENGINE FIRE LIGHT ILLUMINATED WITH NO SECONDARY INDICATIONS. PILOT REPORT IN OPERATOR AOCR - DURING CRUISE FLIGHT ENGINE 1 FIRE LIGHT INTERMITTENTLY ILLUMINATED THEN EXTINGUISHED. MAINTENANCE REPORT IN FMR - UPON RETURN TO BASE #1 ENGINE FIRE LIGHT WAS EXTINGUISHED. REMOVED FORWARD AND AFT FLAME DETECTOR CANON PLUGS. CLEANED CANON PLUGS. REINSTALLED CANON PLUGS. NO DEFECTS NOTED.