As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- WITH NR 1 AND 2 BLEEDS ON, AN ODOR WAS DETECTED INSIDE THE AIRCRAFT. INSPECTED BLEED LINE TO AIR CYCLE MACHINE. FOUND NO EVIDENCE OF OIL. RECONNECTED BLEED LINE. FOUND AIR CYCLE MACHINE OVER SERVICED WHEN PLUG REMOVED. SERVICED AIR CYCLE MACHINE, RAN ENGINE FOR 15 MINUTES. NO SMELL NOTED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.