As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THROUGH FL200, THERE WAS A THIN CLOUD LAYER WITH ICING CONDITIONS. HEARD WHAT SOUNDED LIKE WATER DROPLETS SIZZLING. THEN SMELLED ELECTRICAL SMOKE AND AFTER A FEW SECONDS, SAW SMOKE COMING FROM THE FRONT OF THE GLARESHIELD WHERE THE HEATING ELEMENT FOR THE WINDSHIELD IS. TURNED OFF WINDSHIELD HEAT AND SMOKE CEASED. DECLARED AN EMERGENCY. MAINTENANCE REMOVED AND REPLACED NR 1 WINDSHIELD.