What was found
TOP LEFT CORNER OF L1 WINDOW AROUND SCREWS THERE WAS SPARKS AND SMOKE. WITH L1 WINDOW HEAT TURNED OFF THERE WAS NO SMOKE OR SPARKS. REPLACED WINDOW AND CONTROLLER.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
TOP LEFT CORNER OF L1 WINDOW AROUND SCREWS THERE WAS SPARKS AND SMOKE. WITH L1 WINDOW HEAT TURNED OFF THERE WAS NO SMOKE OR SPARKS. REPLACED WINDOW AND CONTROLLER.