As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LEVEL FLIGHT AT FL340 ON THE LT AUTOPILOT, THE AIRCRAFT STARTED A STEEP CLIMB WITH NO INPUTS REQUESTED. AFTER RECOVERING AND SWITCHING TO THE RT AUTOPILOT (WHICH WORKED FINE AND NORMALLY) THE COMMAND BARS ON THE LT SIDE MADE ERRATIC MOVES UP AND DOWN. [07-23-07] PERFORMED GROUND MAINTENANCE TEST SEVERAL TIMES WITH NO FAILURES. OPERATIONAL CHECKED AUTOPILOT SEVERAL TIMES WITH NO FAILURES. NO DEFECTS NOTED. ALL OPERATIONAL TESTS GOOD. I.A.W. H800XP A.M.M. CH. 34-22-05.