As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODOR IN CABIN. INBOUND CREW REPORTED OIL SMELL COMING FROM NR 1 OR NR 3 ENGINE. ISOLATED TO NR 3 BLEED. NO APU EXTERNAL LEAKS FOUND. REMOVED APU GENERATOR COOLING AIR DUCTS AND FOUND TO BE SOAKED WITH OIL. REPLACED APU COOLING FAN DUE TO LEAKING SEAL.