As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INOPERATIVE DIRTY SOCK ODOR. WHILE ON THE GROUND WITH APU ON THE WHOLE CABIN SMELLED. THE ODOR STOPPED WHEN THE ENGINES WERE RUNNING AND THE APU WAS SHUT OFF. ODOR CAME BACK IN THE DESCENT WITH APU OFF. FROM 5000-1000 FT. R & R THE APU IAW AMM 49-11-11. PERFORMED OPS AND LEAK CHECK OF THE APU IAW AMM 49-00-00. OPS CHECKED GOOD. NO LEAKS NOTED AT THIS TIME R & R 100HM AND 101HM OZONE FILTERS IAW AMM 21-51-41.