As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK DURING CLIMB, THE NR 1 ENGINE FIRE INDICATION LIGHT ILLUMINATED WITH ALARM BELL. ACFT RETURNED TO DEPARTURE. MAINTENANCE REPLACED COCKPIT FIRE PANEL AND FIRE DETECTION CONTROL MODULE. FOUND TERMINAL BROKEN ON HARNESS MW0316 REPLACED SAME. REPLACED HARNESS MW0315 PRECAUTIONARY. PERFORMED ENGINE RUN. NO LEAKS NOTED. FIRE DETECTION TESTS GOOD. AIRCRAFT RETURNED TO SERVICE.