As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4486. CREW REPORTED AFTER TAKEOFF, NOTICED A STRONG ENGINE OIL ODOR IN THE COCKPIT THRU NR 1 PACK. NO ODOR WAS NOTICED IN CABIN. ODOR DISSIPATED IN CRUISE BUT CAME BACK TOP OF DESCENT, THRUST LEVER AT IDLE. ACFT REMOVED FROM SERVICE. NR 1 ENGINE CARBON SEAL REPLACED. PERFORMED ENGINE RUNS IAW ETN-EM-72-034 AND NO FURTHER OIL ODOR NOTICED. AIRCRAFT RETURNED TO SERVICE.