As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: RIGHT EMERGENCY POWER SUPPLY UNIT BATTERY EMERGENCY (12W) WAS FOUND TO HAVE LOW CHARGE. BATTERY FAILED DURING THE PERIODIC SERVICE CHECK PER AA JOB CARD NUMBER 26L00005005 AND AMM 33-51-00 OPERATIONS TEST. RIGHT EMERGENCY POWER SUPPLY UNIT BATTERY EMERGENCY (12W) WAS REMOVED AND REPLACED PER AMM 33-51-38.