As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE - COLD TEMPERATURE IN DSM. WHILE AT GATE DURING BOARDING PLACED RIGHT PACK TO "ON". RT PACK OVER TEMP SHUTDOWN WITH SMOKE IN AFT CABIN. SMOKE DISSIPATED AFTER RT PACK WAS SHUTDOWN. ONLY 15 PASSENGERS WERE DEPLANED PER THE FLIGHT CREW REPORT AND NONE REPORTED ILL EFFECTS. PERFORMED NOGO ODI 2172. PERFORMED PNEUMATIC SYSTEM DUCT BURNOUT. REPLACED RIGHT WATER SEPARATOR TEMP CONTROL VALVE PRECAUTIONARY.