As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM KBWI NR 1 FIRE WARNING LIGHT AND BELL CAME ON MOMENTARILY THEN WENT OFF ENGINE WAS SHUTDOWN IAW COM PROCEDURE. THE CREW RETURNED TO KBWI AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED HORSESHOE DETECTOR, LT CORE DETECTOR, RT CORE DETECTOR, AND RT FAN DETECTOR. OPERATIONAL CHECK GOOD IAW MM 26-10-1. AIRCRAFT WAS RETURNED TO SERVICE. (A)