As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LINE MAINTENANCE NOTED THAT MULTIPLE EMERGENCY LIGHTS FAILED TO ILLUMINATE IN CABIN. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNIT AT POSITION 11WL IN ACCORDANCE WITH AMM 33-51-38-400-001. ALL EMERGENCY LIGHTS WORK NORMALLY.