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 10WL FAILS BITE TEST - REPLACED EMERGENCY POWER SUPPLY UNIT 10WL *AALA202610148967* AND BATTERY *AALA202610146724 * - A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED