As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE PACKS EMIT AN ACRID DIRTY SOCK SMELL ON DESCENT. MAINTENANCE ACCOMPLISHED TROUBLESHOOTING JOB CARDS 03L00021001 AND 03L00036001. REPLACED BOTH COALESCER BAGS IAW AMM 21-51-41-400. REPLACED THE RECIRCULATION HEPA FILTER PER AMM 21-21-23. RAN BOTH ENGINES AND APU WITH BOTH PACKS. NO ODORS AT THIS TIME.