As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT IN CABIN. FOUND EVIDENCE OF CONTAMINATION DUE TO OIL LEAK INTO APU INLET EXTERNALLY. FOUND FUEL IN AFT APU DRAIN MAST. CLEANED APU INLET AREA. REMOVED AND REPLACED ACCESSORY COOLING FAN, FUEL CONTROL UNIT AND BOTH RECIRC FILTERS. FOUND FRESH OIL CONTAMINATION. APU CHANGE REQUIRED. REMOVED AND REPLACED APU.