As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - LAVATORY SMOKE DETECTOR WENT OFF FOR THE SECOND TIME. NO SMOKE OR FIRE NOTED. ON THE FLIGHT DECK THOUGH NOTICED A ODOR IN THE AIR AND BOTH PILOTS SENSED A SCRATCHING IN THEIR THROATS. MAINTENANCE FOUND ENGINE OIL IN THE NR 1 LP FOR THE ENGINE. AIRCRAFT FERRIED TO PDX FOR REPAIRS.