As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, GOT NUMBER 1 ENGINE FIRE WARNING, BOTH LOOPS AND BELL. RETARDED THE THROTTLE AND FIRE WARNING LIGHTS AND BELL WENT OUT. DID NOT SHUT DOWN ENGINE, DID NOT FIRE BOTTLE. RETURNED TO ATLANTA. FOUND CLAMP HAD FAILED ON THIRTEENTH STAGE DUCT IN PYLON. REPLACED CLAMP.