What was found
LEFT ENGINE FIRE LIGHT ILLUMINATED DURING CLIMBOUT, PASSING THROUGH 5000 MSL. THROTTLE WAS REDUCED AND INDICATION WENT AWAY. ACFT RETURNED TO BASE, UNEVENTFUL LANDING. INSPECTION FOUND THAT THE HP BLEED DUCT AT 12:00 POSITION HAD AN OLDER STYLE PAPER GASKET INSTALLED AND WAS FOUND TO BE BURNED OUT CAUSING THE BLEED LEAK AND FIRE INDICATION. AREA WAS DISASSEMBLED AND INSPECTED. NEW METAL STYLE GASKET WAS INSTALLED. ENGINE RUNS COMPLETED WITH NO BLEED LEAK NOTED AND NO FIRE INDICATION. SUBSEQUENT FLIGHT WAS UNEVENTFUL.