As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT 2307 GETTING OIL SMELL APPARENTLY COMING FROM BLEEDS. MAINTENANCE PERFORMED HIGH AND LOW POWER RUNS WITH BOTH ENGINES, ONE BLEED AT A TIME. RAN CABIN AND COCKPIT TEMPS HIGH AND LOW, NO NOTICEABLE OIL SMELL IN AIRCRAFT FROM EITHER BLEED. NO PARTS REPLACED AIRCRAFT RETURNED TO SERVICE.