As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, SMOKE WAS OBSERVED COMING OUT OF F/OS GLARE SHIELD. ACFT RETURNED FOR LANDING. FOUND TERMINAL BLOCK AND RING TERMINAL INSULATION FOR CO-PILOT WINDSHIELD LOW HEAT PWR LEAD MELTED AND CRACKED. THE TERMINAL APPEARED TO BE LOOSE CAUSING A HIGH RESISTANCE CONNECTION LEADING TO THE OVERHEATING AND SUBSEQUENT DAMAGE. REPLACED WINDSHIELD AND POWER LEAD RING TERMINAL, ALL OPS CHECKS OF HEATING SYS SATISFACTORY.