As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG " DIRTY SOCK " SMELL ON DESCENT PACK 1 ON GROUND WITH SAME RESULT. APU BLEED HAS SMELL AS WELL WITH ONLY PACK 2 ON-PERFORMED TSM 05-50-00-810-831-A. NO FURTHER ODOR DETECTED AT THIS TIME. AS A PRECAUTION, R&R RE-CIRCULATION FILTER ELEMENTS IAW AMM 21-21-41. A/C IS OKAY FOR CONTINUED SERVICE.