As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WINDSHIELD ICED UP IN FLIGHT CAUSING REDUCTION IN PILOTS VISIBILITY DURING FLIGHT AND SUBSEQUENT LANDING. VENTILATION TUBE WAS PINCHED AT A 90 DEGREE ANGLE AND THIS ALLOWED PRESSURE AND HEAT TO BURST SIDE WALL OF VENT TUBE. DEFROST AIR WAS UNABLE TO FLOW OVER WINDSHIELD.