As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 11/3/09 CREW REPORTED SMOKE IN THE COCKPIT EMINATING FROM THE ALTITUDE SELECT PANEL DURING PREFLIGHT. MX CHANGED THE ALTITUDE SELECT PANEL AND OPS CHECKS WERE SATISFACTORY. ON 11/5/09, THE EVENT REPEATED, ONCE AGAIN OCCURING DURING THE PREFLIGHT CHECKS, MX FOUND THE LIGHTING POWER SUPPLY PRODUCING HIGH VOLTAGE. THE ALTITUDE SELECT PANEL AND LIGHTING PWR SUPPLY WERE REPLACED.