As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCK ODOR WHILE DESCENDING THROUGH 9000 FT, BOTH PACKS ON. ODOR DISIPATED BY 4000 FT. ACCOMPLISHED ENGINE WASH ON NR 1 ENGINE. TROUBLESHOT IAW TSM 05-50-00-810-831-A, R & R THE NR 1 & 2 PACK OZONE FILTERS IAW AMM 21-51-41. PB 401.