As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN FILLED WITH SMOKE DURING TAXI TO GATE. PAX DEPLANED VIA EMERGENCY SLIDES ON TAXI WAY. REPLACED APU. FOUND TO HAVE OIL CONTAMINATED AIR INLET. SUSPECT EXCESS OIL IN GEARCASE SEEPING FROM CASE VENT TO BE CAUSE. SUSPECT EXCESS CAUSED BY DEFECTIVE OIL CHECK VALVE AND WINDMILLING, WHICH PUMPS OIL FROM TANK TO GEARCASE.