As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACTUATOR LIGHT CAME ON AND WOULD NOT RESET. T/F EVALUATION REVEALED AUTOPILOT TEST FAILED WITH YAW SAS AND BACKUP SAS CAUTIONS ON CAD. WHEN AP1 AND AP2 ARE TURNED ON ACTUATOR CAUTION ON CAD AND Y CAUTION ON PFD APPEAR. REMOVED AND REPLACED YAW SEMA IAW AMM 22-10-00, 4-7.