As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX ON FLIGHT 2494-SUPP-OILY ODOR IN CABIN. COMPLIED WITH VISUAL INSPECTION OF RIGHT HAND ACM AND DUCTING. REMOVED RT PACK DISCHARGE SENSOR AND SAMPLED WITH PACK ON. NO ODOR. REINSTALLED SENSOR. APU BLEED AIR DUCT CLEAN. NO PARTS REPLACED. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.