As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE PERFORMING THE PREFLIGHT INSPECTION THE WINDOW HEAT FAILED. AFTER TROUBLESHOOTING IT WAS FOUND THAT THE CIRCUIT BREAKER FOR THE WINDOW HEAT SUPPLY C239 HAD BURNED. THIS BURNING HAD ALSO CAUSED DAMAGE TO THE CIRCUIT BREAKER IMMEDIATELY ON TOP OF THE WINDOW HEAT CIRCUIT BREAKER.