What was found
PILOT REPORTS, JUST AFTER STARTING AOU AND TURNING ON PACKS THE CABIN FILLED WITH SMOKE. MAINT REMOVED AND REPLACED AIR CYCLE MACHINE AND WATER SEPARATOR.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PILOT REPORTS, JUST AFTER STARTING AOU AND TURNING ON PACKS THE CABIN FILLED WITH SMOKE. MAINT REMOVED AND REPLACED AIR CYCLE MACHINE AND WATER SEPARATOR.