As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE OVERNIGHT MAINTENANCE INSPECTION MAINTENANCE REPORTED THAT THE AISLE EMERGENCY LIGHTS AT ROWS 7 THROUGH 11 WOULD NOT TEST. MILWAUKEE MAINTENANCE FURTHER REPORT THE REMOVAL AND REPLACEMENT OF AN EMERGENCY LIGHT POWER SUPPLY BATTERY PACK AT FUSELAGE STATION 500. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-53-00. THE AIRPLANE HAS RETURNED TO SERVICE.