As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE FIRE HANDLE LIGHTS DO NOT ILLUMINATE DURING TEST. GROUNDED - YES. C/W VISUAL AND PHYSICAL INSPECTION. NO DEFECTS NOTED. REMOVED AND REPLACED FIRE LOOP B HARNESS MW0326 REF B737-800 AMM 26-11-02-000-802, 26-11-02-400-802, GROUND VERIFICATION GOOD.