As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SERVICE CHECK, FOUND TWO EXIT SIGNS AND ONE EMERGENCY LIGHT AT THE L4 DOOR WILL NOT STAY ON MORE THAN FEW SECONDS WHEN TEST SWITCH OR EMERGENCY LIGHT SWITCH IS TURNED ON (DOOR 4L). REPLACED THE BATTERY PACK. PERFORMED OPER TEST ANDNORMAL.