As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED RIGHT ENGINE FIRE WARNING, THEN WHEN SILENCE BELL BUTTON WAS PUSHED FIRE WARNING WENT AWAY. LOOP A TESTED NORMAL. LOOP B ALREADY DEFERRED. FOUND 13TH STAGE BLEED AIR DUCT TO FUEL HEAT VALVE MOUNTING FLANGE SEPERATED AT JOINT. REMOVED AND REPLACED AIR DUCT.