As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE CHECK FLIGHT REQUIRED FOR INFLIGHT DEPLOYMENT OF ADG. ADG TEST FLIGHT UNSATISFACTORY. REMOVED AND REPLACED GCU (S/N OFF: 0570, S/N ON: 0212). OPERATIONAL CHECK OF GCU GOOD. ADG TEST FLIGHT GOOD. GCU COMPONENT REPAIR SHOP TEAR-DOWN FINDINGS, PASSED INCOMING ATP TEST WITH NO ERRORS.