As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, FLIGHT CREW REPORTED NR 2 ENGINE FIRE WARNING INDICATION, AND PERFORMED PRECAUTIONARY ENGINE SHUT DOWN AND FIRE BOTTLE DISCHARGE. MAINTENANCE FOUND MALFUNCTIONING FIRE DETECTION CONTROL UNIT AND REPLACED WITH SERVICEABLE UNIT, NR 1.