As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT EMERGENCY LIGHTS FROM DOOR 3 AFT, INCLUDING GALLEY'S AND AISLE CAME ON AND REMAINED ON. RE-CYCLED FLIGHT DECK AND FORWARD CABIN ATTENDANT'S EMERGENCY LIGHT SWITCHES AND NO CHANGE. LATER IN FLIGHT LIGHTS BEGAN FLASHING ON AND OFF. FLIGHT CONTINUED ON AND LANDING WAS UNEVENTFUL. MAINTENANCE REMOVED AND REPLACED BATTERY PACK. OPERATIONAL CHECKED GOOD AND AIRCRAFT RETURNED TO SERVICE.