As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAINT DIRTY SOCK ODOR DETECTED IN FLIGHT DECK ONLY ON DESCENT AS WE PASSED THROUGH APPROXIMATLY 8000 MSL.ODOR DISSIPATED BY 5000 MSL AND FLIGHT ATTENDANTS REPORTED NO ODORS IN CABIN. REMOVED APU COMBUSTOR DRAIN & FOUND CONTAMINATED WITH OIL. REPLACED THE APU PER AMM 49 11 00 000 803. LEAK AND OPS CHECK GOOD. NO ODOR NOTED.