As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH NR 1 FIRE HANDLE ILLUM AND FIRE WARN BELL SOUNDED. THE THROTTLES WERE AT FLT IDLE. REPEAT WRITE UP. FIRE WARNING 1-2 SEC. *S/D* REMOVED AND REPLACED NR 1 CONTROL UNIT AND NR 1 STRUT FIREWALL LOOP AS PRECAUTIONARY SYS PER MM 26-11-012-4 & 26-11-002-5.