As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4521 THE CREW REPORTED A HEAVY OIL ODOR THROUGHOUT THE AIRCRAFT. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED NUMBER 1 ENGINE PER AE WORKCARD 71-000-00. THE LEAK AND OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.