As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB FLIGHT CREW SMELLED AND VISUALLY CONFIRMED SMOKE IN COCKPIT. THEY SHUTOFF WINDSHIELD HEAT AND PITOT/STALL HEAT AND SMOKE DISSIPATED. FLIGHT RETURNED TO POINT OF DEPARTURE FOR INVESTIGATION. MAINTENANCE FOUND SURFACE CORROSION ON PITOT/STALL HEAT SWITCH WIRING CONNECTORS. CONNECTORS AND SWITCH REPLACED NEW. OPERATIONS CHECK C/O SATISFACTORY AND AIRCRAFT RETURNED TO SERVICE. (TC NR 20060427005)