What was found
DURING CLIMB, RT ENGINE FIRE WARNING LIGHT ILLUMINATED. FLT CREW RETARDED POWER PACK ON RT ENGINE (WHICH WAS AT MAX CONTINUOUS ITT INDICATION), REQUESTED CLEARANCE TO FL 390 AND DECLARED AN EMERGENCY. UPON PULLING POWER BACK THE FIRE WARNING LIGHT EXTINGUISHED. ADVANCING POWER ON THE AFFECTED ENGINE DID NOT CAUSE THE LIGHT TO ILLUMINATE AGAIN. NO DIFFERENCES OBSERVED BETWEEN LT AND RT ENGINE INDICATIONS. FLIGHT CREW PERFORMED FIRE WARNING CHECKLIST AND DETERMINED THAT THERE WAS A FALSE FIRE INDICATION. FLIGHT CREW UNDECLARED THE EMERGENCY. AC LANDED WITHOUT INCIDENT. AN EXTENSIVE VISUAL INSPECTION OF THE FIRE WARNING SYS WAS PERFORMED WITH NO DEFECTS NOTED. FIRE LOOP TEST WAS PERFORMED WITH NO DEFECTS NOTED. ENGINE RUNS WERE PERFORMED WITH NO DEFECTS NOTED. UPON DISCUSSION WITH MFG SPECIALISTS, IT WAS STATED THAT, WHEN CLEARED TO FL DIRECT, AND AT MAX ITT AN OCCASIONAL FALSE FIRE WARNING WILL BE TRIGGERED. FALSE FIRE INDICATION HAS NOT RECURRED. SUSPECT NOT-RECURRING ELECTRICAL PHENOMENON.