As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT DESCEND THROUGH 20-25K. IT WAS A DIRTY OILY SOCK SMELL. PERFORMED INSPECTION OF HIGH PRESSURE DUCT & INTERMEDIATE PRESSURE DUCT ON BOTH ENGINES. REMOVED AND REPLACED LEFT WATER EXTRACTOR ASSY LEAK AND OPS CHECK GOOD. REMOVED AND REPLACED LEFT PACK TEMP CONTROL VALVE.