As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ARRIVAL AT GATE, FLIGHT CREW REPORTED THE FIRE BELL SOUNDED AND THE NR 1 ENGINE FIRE HANDLE WAS ILLUMINATED. PULLED NR 1 FIRE HANDLE AND DISCHARGED THE LEFT BOTTLE INTO THE NR 1 ENGINE. INSPECTED NR 1 ENGINE FOR EVIDENCE OF FIRE, NONE FOUND. INSPECTED FIRE DETECTION SYSTEM FOR DEFECTS PER MM 26-11-0. NO DEFECTS NOTED. INSPECTED FIRE LOOP. NO DEFECTS NOTED. REPLACED FIRE DETECTION UNIT, FIRE CONTROL MODULE AND NR 1 ENGINE FIRE BOTTLE, RAN ENGINE FOR SEVERAL MINUTES AND NO DEFECTS WERE NOTED.