As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GROUND AFTER START, TURNED ON APU BLEED AIR & CABIN PACK RECEIVED A BURNED, MUSTY ODOR AND WHITE SMOKE FILLED THE CABIN . THE CABIN PACK TEMP SELECT WAS AT 65, AND THE SUPPLY WAS AT 195 AND CLIMBING. AFTER TURNING OFF THE CABIN PACK THE ODOR AND SMOKE SLOWLY DISSIPATED. INSPECTED CABIN ACM AND FOUND TURBINE COMPRESSOR NOT ROTATING. REMOVED & REPLACED CABIN TURBINE COMPRESSOR IAW MM 21-51-00. OPS AND LEAK CHECKED GOOD.