As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TESTING SYS, NR 1 DETECTOR SYS A NR 1 FIRE HANDLE LIGHT COMES ON AND STAYS ON AFTER TEST IS COMPLETE. IN FLIGHT SHUTDOWN FOR FIRE WARNING EARLY TODAY. B SYSTEM ALREADY ON MCO. REPLACED LWR A-B FIRE LOOP, DET UNIT AND CONTROL PANEL.