What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT 13WL FAULTED DURING TEST. REPLACED EPSU 13WL WITH SERVICEABLE UNIT, OPS CHECK GOOD.
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 13WL FAULTED DURING TEST. REPLACED EPSU 13WL WITH SERVICEABLE UNIT, OPS CHECK GOOD.