As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN THE SUPPLIED DOCUMENTATION FROM S-TEC WE HAVE BEEN ABLE TO FIND ANY INFORMATION ABOUT AUTOPILOT LOSS-IN-TURN AND OTHER CRITICAL LIMITS. THIS SEVERELY HAMPERS OUR ABILITY TO DETERMINE WHETHER OR NOT OUR AUTOPILOT IS OPERATING IN A CORRECT FASHION.