As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOMENTARY FIRE WARNING SIGNAL ON DESCENT AT IDLE. LASTED ONE TENTH OF A SECOND WITH BRIEF FLASH OF FIRE WARNING MASTER LIGHT / BELL. NO LIGHT ON FIRE HANDLE. REMOVED AND REPLACED FIRE DETECTION ASSEMBLY UNIT. BITE CHECK OPS CHECK GOOD.