As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INBOUND TO DAY, ODOR OF BURNING OIL AROUND CAPT AND FO AREA, ALSO NO AIR FLOW FROM OUTLETS. SHUTOFF NR 1 TC THEN NR 2 TC AND ODOR DISSIPATED. NOTED LOUD RUMBLING WHEN EITHER NR 1 OR NR 2 T/C WAS OPERATING ALONE. FOUND NR 1 T/C CHECK VALVE CRACKED. REMOVED AND REPLACED NR 1 T/C CHECK VALVE OPS CK GOOD. OPERATED NR 1 AND NR 2 TC'S, NO RUMBLING OR ODORS OF OIL NOTICED ON GROUND.