As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, THE CREW SEEN SOME SPARKS AND A SMALL PUFF OF SMOKE FROM THE LEFT HAND WINDSHIELD, AROUND THE TERMINAL BLOCK. NO EMERGENCY WAS DECLARED. THE AIRCRAFT LANDED WITHOUT ANY FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT WINDSHIELD HEAT CONTROLLER.