As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ODOR(DIRTY SOCK SMELL)DURING DESCENT ALL THE WAY TO SHUTDOWN. STARTED APPROXIMATELY 14,000 FEET. MAINTENANCE FOUND THE APU OIL COOLING FAN LEAKING AT THE TRANSFER TUBES, REPLACED THE OIL COOLING FAN AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51.