As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NR 1 GROUNDED CIRCUIT DETECTION LIGHT INTERMITTENTLY FLICKERS IN FLT. REMOVED AND REPLACED NR 1 ENG FIRE DET GROUND LIGHT AT P6 PNL ELECTRICAL CONNECTIONS AT HARNESS. CLEANED AND RESEATED DETECTOR CONTROL UNIT FUNCTION CHECKED PER MM 26-11 INDICATIONS SERVICEABLE.