As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED SMOKE IN COCKPIT AFTER TAKEOFF AND RETURNED TO THE AIRPORT MAKING AN UNEVENTFUL LANDING. MX INSPECTED THE ACFT AND FOUND A LOOSE CONNECTION AT THE LANDING LIGHT SWITCH WITH BURNED WIRING INSULATION. INSTALLED NEW WIRING AND CONNECTOR AS NEEDED AND OPS CHECKED GOOD. PUSH-ON TYPE OF WIRING CONNECTORS NEED TO BE CHECKED CLOSELY FOR SECURITY DURING SCHEDULED MX.