As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNIT 11WL FAILED BITE TEST - MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 11WL *AALA202610080799* AND BATTERY *AALA202610082528* - A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED