As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POOR OPERATION OF AUTOPILOT GYRO. FOUND LAST OVERHAUL WAS NOT PROPER. ROTOR BEARINGS HAVE EXCESSIVE PRELOAD. PENDULUMS HAVE BEEN ALTERED. ADDITIONAL CERAMIC PENDULUM STOPS ADDED BY ALTERING BOTTOM PLATE. HORIZON ARM RUBBING AT LEVEL FLIGHT POSITION AGAINST PIN CASTING.