As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3244 - ATB/FUME - AFTER TAKEOFF CREW REPORTED THEY WERE RETURNING TO STL DUE TO OILY FUMES IN CABIN. CORRECTIVE ACTION: MAINTENANCE CONFIRMS APU HAS AN EXTERNAL OIL LEAK BEING INGESTED INTO INLET. OIL LEAK COMING FROM APU OIL DRAIN PLUG AND PAD. REPAIRED OIL LEAK AND DECONTAMINATED A/C DUCTING. OK FOR SERVICE. (7301934)