What was found
AFTER TAKEOFF GOT A STRONG DIRTY SOCK SMELL SOON AFTER SHUTTING DOWN THE APU. RETURNED TO AIRPORT, APU INLET AND INTAKE INGESTED OIL, REPLACED APU COOLING FAN ASSY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER TAKEOFF GOT A STRONG DIRTY SOCK SMELL SOON AFTER SHUTTING DOWN THE APU. RETURNED TO AIRPORT, APU INLET AND INTAKE INGESTED OIL, REPLACED APU COOLING FAN ASSY.