As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE THE EXTERNAL EMERGENCY LIGHT OVER THE LEFT AND RIGHT WING AND AISLE CEILING LIGHT AT ROW 14 WERE FOUND INOPERATIVE.MAINTENANCE REPLACED THE #4 BATTERY POWER SUPPLY.OPERATIONAL CHECKS WERE GOOD.THE AIRCRAFT WAS RELEASED FOR SERVICE.