As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THROUGH FL220 DIRTY SOCK SMELL IN CABIN + COCKPIT. PACK 2 WAS DEFERRED APU OFF-PERFORMED TSM 05-50-00-810-831-A. NO ODOR NOTED ON APU, ENG 1, OR ENG 2. PERFORMED DECONTAMINATION OF ECS IAW AMM 21-00-00-615-802-A AS PRECAUTIONARY. A/C OK FOR SERVICE.