As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT ATTITUDE FAILURE OF THE KI300 HORIZON INDICATOR. PRIMARY ATTITUDE INDICATOR INTERMITTENTLY AND WITHOUT WARNING INDICATES ERRONEOUS PITCH AND ROLL ATTITUDES AND ALSO, WHEN INTERFACED TO THE AUTOPILOT CAUSES THE AUTOPILOT TO DEVIATE FROM ITS INTENDED FLIGHT PATH.