As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- FOLLOWING ENGINE START CABIN AND COCKPIT FILLED WITH SMOKE FROM AIR DUCTS. RECEIVED SMOKE AFT LAVATORY WARNING. RIGHT PACK AUTO FAIL MESSAGE FOLLOWED. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE AIR CYCLE MACHINE. OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.