As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3516 THE CREW REPORTED AN OIL SMELL COMING FROM PACKS IN FLIGHT. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED ENGINE GROUND RUN IAW AMM CHPT 71=00=01 AND OPERATIONAL CHECK OF AIR DISTRIBUTION IAW AMM 21-10-00. NO OIL SMELL OR HAZE NOTED DURING GROUND RUN. NO PARTS REMOVED OR REPLACED. THE AIRCRAFT WAS RETURNED TO SERVICE.