As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH TO LANDING PILOT NOTICED SPARKING TWICE UNDER THE COPILOTS YOKE, AND NOTICED A BURNING SMELL. LANDED WITHOUT INCIDENT. THE MECHANIC FOUND A DIMMING RESISTOR LOOSE IN SUBPANEL. HE REPAIRED THE ITEM AND APPROVED THE A/C FOR RETURN TO SERVICE.