As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE EXPERIENCED O-ZONE ODOR AND INTERMITTENT SMOKE FROM BEHIND INSTRUMENT PANEL WHEN AUTO-PILOT WAS ENGAGED. GROUND INSPECTION REVEALED AUTOPILOT CONTROLLER WAS SHORTED/OVERHEATED. REPLACED CONTROLLER AND AIRCRAFT RETURNED TO SERVICE.