As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT BATTERY AT RIGHT HAND OVERWING EMERGENCY EXIT DOOR FAILED SYSTEM TEST. REPLACED BATTERY FOR EMERGENCY POWER SUPPLY UNIT AT RIGHT HAND OVERWING EMERGENCY EXIT DOOR PER AMM 33-51-38.