As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- DURING DESCENT FIRE SYSTEM FAULT STATUS MESSAGE CAME ON. THE FIRE DETECTION CIRCUITS TESTED OKAY. AFTER LANDING FIRE DETECTION SYSTEM FAULT STATUS MESSAGE WENT AWAY. REMOVED AND REPLACED FIDEX CONTROL UNIT. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.