As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE SITTING AT THE GATE WITH THE APU RUNNING, THE CREW REPORTED A SMOKE SMELL IN THE CABIN. MAINTENANCE INSPECTED AND REPLACED THE PACK VALVE IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 21-00-00. OPERATIONAL CHECKS WERE COMPLETE AND THE AIRCRAFT WAS RELEASED FOR SERVICE.