As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, THE MASTER FIRE WARNING BELL SOUNDED AND LIGHTS ILLUMINATED INTERMITTENTLY. AIRCRAFT CONTINUED DESCENT AND LANDED WITHOUT INCIDENT. RESEATED ALL FIRE WARNING CIRCUIT CARDS, EXERCISED WARNING RESET SWITCHES AND REPLACED ENGINE FIRE WARNING MODULE. OPERATIONAL CHECK GOOD.