As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A SERVICE CHECK, THE OVERWING EMERGENCY EXIT LIGHTS (ON FUSELAGE) WERE FOUND INOPERATIVE DUE TO A NON FUNCTIONING RECHARGEABLE BATTERY POWER SUPPLY. BATTERY WAS FOUND TO BE CHARGED BUT UNIT NOT PROVIDING POWER TO LIGHTS. UNIT TO BE REPLACED WITH SERVICEABLE.