As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT AT 310, A STRONG ACRID SMOKE ODOR AND WHIPSY SMOKE CAME FROM THE AUTOPILOT VERTICAL SPEED WHEEL. DECLARED EMERGENCY AND PERFORMED EMERGENCY CHECK LISTS. LANDED AT CLEVELAND HOPKINS AIRPORT WITHOUT INCIDENT. REPLACED THE AUTOPILOT CONTROLLER.