As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - OIL ODOR IN CABIN AND COCKPIT, ODOR DISSIPATES WHEN THE APU IS SHUT DOWN. MAINTENANCE PERFORMED A DETAILED INSPECTION OF THE APU INCLUDING THE DUCT AND OIL SYSTEMS, NO DEFECTS NOTED. GROUND RUN ON ENGINES AT HIGH POWER FOR 20 MINUTES AND VARIOUS SETTINGS FOR 20 MINUTES. RAN BETWEEN APU AIR AND ENGINE BLEED AIR. NO DEFECTS OR ODORS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.