As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT AT FL390 RECEIVED (WINDSHIELD HEAT L FAIL) CAS MSG FOLLOWED BY THE FRACTURING OF THE OUTER PLY OF THE LT WINDSHIELD. PERFORMED ELECTRICAL HEATED WINDSHIELD FUNCTIONAL TEST IAW CESSNA 750 M/M 30-41-00, REMOVED LT WINDSHIELD. INSTALLED NEW L/H WINDSHIELD. PERFORMED ELECTRICAL HEATED WINDSHIELD FUNCTIONAL TEST IAW CESSNA 750 MM 30-41-00. NO DISCREPANCIES AT THIS TIME. INSTALATION OF WINDSHIELD WAS PERFORMED IAW CESSNA 750 M/M 56-11-00.