As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROXIMATELY FL100 THE CAPTAIN TURNED ON THE LEFT SIDE CHART HOLDER LIGHT AND IT BEGAN TO SMOKE. THE CHART HOLDER LIGHT WAS TURNED OFF AND NO FURTHER SMOKE WAS REPORTED. THE CREW DECLARED AN EMERGENCY AND DONNED O2 MASKS AND DIVERTED TO KBUF AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE CAPTAIN'S CHART HOLDER LIGHT WIRING SHORTED AND PRODUCING SMOKE. THE CHART HOLDER HARNESS WAS DISCONNECTED AND PLACED ON MEL. THE MEL WAS CLEARED IN KCVG WHEN THE CHART HOLDER WAS REPLACED.