As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FL 741 - IN CRUISE AT FL310, CREW REPORTED THAT THE COCKPIT WAS FILLING UP WITH SMOKE. CREW DONNED THEIR OXYGEN MASKS AND SMOKE GOGGLES AND PERFORMED AN EMERGENCY DESCENT. FLIGHT DIVERTED TO CLE AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE FOUND THE LOWER LEFT CORNER OF THE L1 WINDSHIELD ARCING AND SMOKING WITH THE WINDSHIELD HEAT ON. THE WINDSHIELD AND HEAT CONTROL WERE REPLACED. (M)