As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTS THAT ON DESCENT, THE A/C SMELLS VERY BAD, LIKE A GYM SOCK. MAINTENANCE INSPECTED THE ACM COMPARTMENT, THE ACM AND ALL ASSOCIATED DUCTING WITH NO DEFECTS NOTED. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.