What was found
AFTER THE PASSENGERS HAD BEEN BOARDED, HALFWAY THROUGH THE PREFLIGHT BRIEFING SMOKE BEGAN FORMING IN THE CABIN. THE FIRST OFFICER EVACUATED THE PASSENGERS AND THEN THE FLIGHT ATTENDANT. THE APU GENERATOR HAD FAILED, THUS CAUSING THE HX FAN TO NOT OPERATE WHICH CAUSED THE LEFT HAND PACK TO OVERHEAT. THE FIRE DEPARTMENT WAS DISPATCHED TO THE AIRCRAFT. THE FIRST OFFICER, FLIGHT ATTENDANT, AND FIRE FIGHTERS LOOKED FOR EVIDENCE OF A FIRE. THE AIRCRAFT WAS FERRIED TO DAY WHERE MAINTENANCE INSPECTED AND REPLACED THE 1VE PANEL AND THE BUS POWER CONTROL UNIT IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 24-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.