As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3861, CREW REPORTED STRONG OIL BURNING SMELL IN CABIN DURING TAKEOFF WITH APU ON. ALSO GOT STRONGER OIL BURNING SMELL ON DESCENT WITH APU OFF. AIRCRAFT REMOVED FROM SERVICE. C/A-REMOVED AND REPLACED LEFT ENGINE ZERO CARBON SEAL. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE