As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS UNIT (ZERO TIME SINCE REPAIR) WAS REMOVED FROM SHELF STOCK AND INSTALLED IN PLACE OF AIRCRAFT'S FAULTY ACU. DURING INSTALLATION, NOTED THERE WAS NO OUTPUT VOLTAGE TO ALTERNATOR FIELD. UNIT WAS REMOVED WITH ZERO TIME IN SERVICE SINCE INSTALLATION.