As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4739 CREW REPORTED DURING CRUISE AND DESCENT THE SMELL OF BURNING OIL COMING FROM PACKS. ACFT REMOVED FROM SERVICE. R&R LT ENGINE. IAW EMB WORK CARD NR 71-000-00. OPS CHECKED GOOD AND LEAK CHECK GOOD. ACFT RETURNED TO SERVICE.