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 SIGN AT DOOR 2L EXTINGUISHED AFTER ONLY FIVE SECONDS OF OPERATION. MAINTENANCE FOUND THE BATTERY PACK AND POWER SUPPLY MODULE TO BE DEFECTIVE AND REPLACED IT. SYSTEM OPERATION WAS NORMAL AFTER THE BATTERY AND POWER SUPPLY WERE REPLACED.