What was found
PILOT REPORTED THAT HIS FIRE INDICATION LIGHT HAD FLICKERED A COUPLE OF TIMES BUT THEN WENT AWAY. LIGHT WOULD NOT FLICKER ON THE GROUND WHILE NOT RUNNING. MECHANIC COULD NOT FIND THE FAULT. CLEANED THE CONNECTIONS AND FIRE DETECTION PROBES AND TRIED A RUN UP. FIRE LIGHT AGAIN FLICKERED A COUPLE OF TIMES THEN WENT OUT. TROUBLESHOOTING AGAIN FOUND A FIRE DETECTION PROBE TO BE PROBABLE. CHANGED THE PROBE AND AGAIN RAN UP THE AC. THIS TIME THE FIRE SYSTEM WORKED IAW THE MM. TOOK THE AC FOR A FLIGHT TO DETERMINE PROPER FUNCTION UNDER FLIGHT LOADS AND AGAIN THE SYSTEM WORKS IAW MM. RETURNED THE AC TO SERVICE. (K)