As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT "WINDSHIELD HEAT FAIL" CAS MESSAGE APPEARED. THE FLIGHT CREW MADE AN AIR-TURN BACK TO MKE DUE TO CONVECTIVE ACTIVITY ENROUTE TO YYZ. MAINTENANCE TROUBLE SHOOT THE WINDSHIELD HEAT SYSTEM FOUND THE RT WINDSHIELD FAILS WHEN THE AIRCRAFT IS PRESSURIZED. MAINTENANCE REMOVED AND REPLACED THE RT WINDSHIELD AND RETURNED THE AIRCRAFT TO SERVICE.