As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) DEFECT DISCOVERED DURING AC HEAVY MX VISIT. DURING OPS TEST OF EMERGENCY LIGHTING SYSTEM, EMERGENCY L BATTERY FAULT (11WL) IS SHOWN. EMERGENCY LIGHT BATTERY 11WL REPLACED AND TESTED SERVICEABLE IAW AMM 33-51-38-400-002-A.