As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 3 - UPON LANDING AT PHL AND APPLYING REVERSE THRUST, THE CREW RECEIVED A FIRE WARNING ON THE LEFT ENGINE. CREW ACTIVATED BOTH FIRE BOTTLES. WITH ENGINE OUT OF REVERSE, THE FIRE WARNING CEASED. NO EVIDENCE OF ACTUAL FIRE WAS FOUND. MAINTENANCE REPLACED THR NR 1 ENGINE FIRE DETECTION UNIT. (M)