As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - INFLIGHT SMOKE IN CABIN. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. AIRCRAFT OUT OF SERVICE FOR EVALUATION. FOUND OIL LEAK AND OIL INGESTION FROM PREVIOUS NUMBER 2 ENGINE CHANGE. ACCOMPLISHED PACK BURN AND DUCT CLEAN OUT. SYSTEM GROUND CHECKED NORMAL OPERATION.