As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE HANDLE NOT ILLUMINATING DURING FIRE TEST, AS WELL AS THE NR 1 ENGINE OVERHEAT LIGHT. ACFT GROUNDED. REMOVED AND REPLACED THE NR 1 ENGINE CORE FIRE DETECTION HARNESS MW0326 IAW AMM 26-11-02. PERFORMED A GOOD OPS TEST OF ENGINE FIRE DETECTION SYSTEM IAW AMM 26-11-00-710-801.