What was found
SEA - AFTER APU START WITH AIR ON AND EITHER PACK ON, SMOKE FILLED CABIN. REPLACED WATER SEPARATOR SOCKS.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SEA - AFTER APU START WITH AIR ON AND EITHER PACK ON, SMOKE FILLED CABIN. REPLACED WATER SEPARATOR SOCKS.