As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED A DIRTY SOCK SMELL ON IDLE DECENT INTO DFW THRU 10,000. WENT AWAY THRU APPROXIMATLEY 5000 FT. MAINTENANCE FOUND SIGNIFICANT OIL CONTAMINATION AT THE APU INLET AND CONFIRMED THE V-BAND SEAL WAS COMPLETELY SATURATED WITH OIL. MAINTENANCE REPLACED THE APU AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER TASK CARD 26L31049003.