As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE THE LEFT AND RIGHT AFT OVERWING EMERGENCY LIGHTS AND THE AFT AISLE PATH EMERGENCY LIGHTS WERE INOPERATIVE.MAINTENANCE REPLACED THE #4 EMERGENCY BATTERY PACK.OPERATIONAL CHECKS WERE GOOD.THE AIRCRAFT WAS RELEASED FOR SERVICE.