As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STRONG ODOR OF DIRTY SOCK, EXHAUST ODOR. STRONGEST DURING DESCENT AT AROUND 6000 FT. FOUND THE APU OIL OVERSERVICED, CORRECTED BUT ODOR STILL EXISTS. REPLACED THE APU IAW CARD 26L31049005 AND ACCOMPLISHED TASK CARD 26L00021004 FOR DECONTAMINATION. NO CABIN ODOR AT COMPLETION . ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. THE AIRCRAFT WAS GROUNDED.