As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG SOCK SMELL ON DESCENT PACK 2 ISOLATED. DESCRIPTION OF ODOR/FUMES: PERSISTENT, DIRTY SOCKS SMELL. APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-PERFORMED PACK BURN OUT PER AMM 21-00-00