As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER REPORTED BURNT RUBBER ODOR AFTER TAKEOFF AND CRUISE. FLIGHT ATTENDANTS REPORT SLIGHT ODOR OF BURNT RUBBER IN AFT GALLEY. STILL AWAITING FOR FINAL CORRECTIVE ACTION. REMOVED AND REPLACED LEFT ENGINE. VENDOR TEARDOWN REPORT CONFIRMED OIL LEAKAGE IN HIGH PRESSURE COMPRESSOR CAUSED BY NR 3 BEARING AFT SEAL.