As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TESTED, THE NR 1 ENGINE FIRE EXTINGUISHER 'T' HANDLE WOULD NOT ILLUMINATE. MAINTENANCE CLEANED THE ELECTRICAL CONNECTOR BETWEEN THE 'T' HANDLE AND SHAFT, THEN REPLACED THE NR 1 FIRE DETECTION CONTROL MODULE. SYSTEM WAS CHECKED IAW MM PROCEDURES AND OPS CHECKED GOOD. AIRCRAFT WAS THEN RELEASED FOR SERVICE.