As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH THE PILOT NOTICED SMOKE IN THE COCKPIT. PILOT PUT ON OXYGEN MASK AND LANDED WITHIN FIVE MINUTES WITHOUT FURTHER PROBLEMS. MAINTENANCE FOUND RESISTOR R19, A 100 OHKM 2 WATT RESISTOR, CRACKED FROM HEAT. TRANSISTOR Q7 WAS SHORTED FROM BASE TO EMITTER. ROOT CAUSE WAS TRANSISTOR TO COPILOT INSTRUMENT LIGHTING CIRCUIT SHORTING OUT. REPAIRS ARE UNDER WAY.