As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORM ADG DEPLOYMENT TEST FLIGHT. ADG FAILED TO POWER AC ESS BUS TEST FLIGHT UNSATISFACTORY. REPLACED GCU, (S/N OFF: 0212, S/N ON: 0290). COMPLETED TEST FLIGHT REQUIREMENTS. NO DEFECTS NOTED. GCU COMPONENT REPAIR SHOP TEAR-DOWN FINDINGS, NO FAULT FOUND (NFF).