As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN OVERNIGHT LINE CHECK THE EMERGENCY LIGHTS AT DOORS 1L AND 1R WOULD NOT ILLUMINATE. MAINTENANCE FOUND THE ASSOCIATED BATTERY PACKS TO BE DEFECTIVE AND REPLACED THEM. SYSTEM OPERATION CHECKED NORMAL AFTER THE BATTERY PACKS WERE REPLACED.