As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WINDSHIELD ANTI-FOG SWITCH TURNED ON DURING DESCENT AND ABOUT 5 MIN AFTER A WHITE SMOKE CAME FROM THE CTR WINDSHIELD SENSOR. THE ANTIFOG WAS TURNED OFF AND PROBLEM STOPPED. FOUND ARCING ON CTR WINDSHIELD THERMAL SWITCH. REPLACED SWITCH, S1-221 AND TERMINALS IAW AMM. HEATING ELEMENT ON CTR WINDSHIELD WITHIN AMM TOLERANCES. APPLICABLE PART OF OPN 5088 C/W. OK FOR SERVICE. CTR WINDSHIELD ANTI-FOG CHECKS IAW AMM.