As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"FIRE SYS FAULT" STATUS MESSAGE. (INTERMITTENT ON & OFF). PLACED ON MEL 26-00-1 REF TO PAST T/S IN TRAX AND NO CURRENT FAULTS IN MDC OR STATUS MSG. R & R RT ENG UPPER AND LWR FIRE DETECT RAILS AS A PRECAUTIONARY MEASURE IAW AMM 26-11-01-000/400-802 AND 26-11-03-000/400-802. FIRE DETECT SYS TEST GOOD, NO STATUS MSG SHOWN. MEL CLEARED. RETURNED TO SERVICE.