As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, SMOKE FILLED INTO THE CABIN. FIRST, TURNED ALL ELEC OFF SWITCH. VENTED THE CABIN BY OPENING THE FRONT VENT AND WINDOW (PILOT SIDE). AFTER DETERMINING THERE WAS NO DANGER TO THE SAFE OPERATION OF THE AIRCRAFT, CONTINUED TO ALTERNATE AIRPORT, THEN TURNED ON PRIMARY INSTRUMENTS AND LATER THE AIRCRAFT FAN, THEN DETERMINED IT WAS THE AIRCRAFT 7 INCH FAN. BECAUSE OF THE NATURE OF THE FAILURE, RETURNED TO THE PRIMARY A/P WITHOUT INCIDENT. (X)