As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - AFTER TAKEOFF NOTICED ODOR AND SMOKE IN CABIN. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. FOUND LARGE OIL LEAK ON APU COMPARTMENT AND BLEED DUCT WITH OIL CONTAMINATION. REMOVED APU ASSEMBLY AND CLEANED APU COMPARTMENT. REPLACED WATER SEPARATOR BAGS AND ACCOMPLISHED PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION.