What was found
STL - CREW REPORTED SMOKE IN CABIN. RETURNED TO STL AND LANDED WITHOUT INCIDENT. FOUND APU HAD INGESTED OIL. REPLACED APU ON 16 SEPTEMBER AT DFW. SYSTEM GROUND CHECKED NORMAL OPERATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
STL - CREW REPORTED SMOKE IN CABIN. RETURNED TO STL AND LANDED WITHOUT INCIDENT. FOUND APU HAD INGESTED OIL. REPLACED APU ON 16 SEPTEMBER AT DFW. SYSTEM GROUND CHECKED NORMAL OPERATION.