As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERY STRONG ODOR OBSERVED FROM AIR CONDITIONING SYSTEM, DURING DESCENT BELOW 15000 FEET UNTIL LANDING. ODOR IS SIMILAR TO SWEATY SOCKS. R & R BOTH RECIRCULATING FILTERS IAW AMM 21-21-14. PERFORMED CHECK. CHECK PASSED. NO FURTHER ODORS NOTED.