As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT FAILED DURING DESCENT, PILOT SMELLED ELECTRICAL ODOR/FUMES. PILOT SAW SMOKE COMING FROM AUTOPILOT ENGAGE BUTTON. PILOT PULLED AND SECURED AUTOPILOT CIRCUIT BREAKER, SMOKE CLEARED IMMEDIATELY. AN INTERNAL INVESTIGATION OF THE AUTOPILOT COMPUTER REVEALED A BURNED CAPACITOR. THIS COMPONENT IS ONLY FUNCIONALLY TESTED EACH YEAR DURING ANNUAL AVIONICS INSP. IT IS AN ON CONDITION ITEM.