As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CREW OBSERVED ELECTRICAL ARCING AND GLOWING ON TOP OF THE LT FRONT WINDSHIELD. THE WINDSHIELD HEAT WAS TURNED OFF AND THE OUTER PANE SUBSEQUENTLY SHATTERED. THEY DECLARED AN EMERGENCY. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT.