As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CAPTAIN`S MAIN WINDSCREEN WINDOW HEAT GOES DIRECTLY TO OVERHEAT WHEN SWITCH SELECTED. DURING TROUBLESHOOTING IT WAS FOUND THAT THE CONTROL BOX HAS AN INTERNAL SHORT CAUSING A VERY LARGE CURRENT DRAW POPPING THE MAIN POWER BREAKER. CONTROLLER REPLACED. MFG OF THE PART.