As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A LINE MAINTENANCE CHECK, THE FIRE WARNING BELL IN THE COCKPIT WAS FOUND TO BE INOPERATIVE DURING A FIRE TEST. REMOVED AND REPLACED THE ENGINE FIRE DETECTION UNIT. OPERATIONALLY CHECKS GOOD PER MAINTENANCE MANUAL CHAPTER 261101.