As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE TEST FLIGHT, ACTUATOR LIGHT CAME ON CAD ALONG WITH AMBER Y ON PFD. MASTER CAUTIONS ILLUMINATED, NO GONG DETECTED. ON STATUS PAGE UNDER AFCS SUBSYS, YAWEMA INVALID MESSAGE APPEARED. REMOVED AND REPLACED SEMA ACTUATOR.