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 LIGHT FOR THE RT AFT OVER WING EXIT WOULD NOT ILLUMINATE. MX FOUND THE ASSOCIATED BATTERY PACK TO BE DEFECTIVE AND REPLACED IT. SYS OPERATION WAS NORMAL AFTER THE BATTERY PACK WAS REPLACED. (K)