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 EXIT SIGNS AT THE LT OVERWING EMERGENCY EXITS WERE INOPERATIVE. MX FOUND THE ASSOCIATED BATTERY PACK TO BE THE CAUSE AND REPLACED IT. SYSTEM OPS WAS NORMAL AFTER THE BATTERY PACK WAS REPLACED. (K)