What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT 10WL FAILED FUNCTIONAL CHECK AND IS INOPERATIVE. REPLACED EMERGENCY POWER SUPPLY UNIT 10WL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT 10WL FAILED FUNCTIONAL CHECK AND IS INOPERATIVE. REPLACED EMERGENCY POWER SUPPLY UNIT 10WL.