As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE DESCENDING THROUGH FL 330, THE AUTOPILOT DISENGAGED AND EXPERIENCED A VIOLENT PITCH UP, FOLLOWED BY A MULTITUDE OF CAS MESSAGE SUCH AS "FW COMP FAIL" BEGAN RUNNING CHECKLIST, ALL MSG'S WENT AWAY. THE REMAINDER OF THE FLIGHT WAS UN-EVENTFUL. THE AUTOPILOT SYSTEM OPERATIONALLY CHECKS NORMAL AT THIS TIME AND IS OKAY FOR RETURN TO SERVICE IN ACCORDANCE WITH THE CESSNA 750 MAINTENANCE MANUAL CHAPTER 22-10-02.