As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SWEATY SOCK SMELL ON DESCENT AT 5000'. COCKPIT/FWD CABIN HAD THE SMELL. PACK 1 ISOLATED THE SMELL PER OPS BULLETIN PROCEDURE. PER TSM 71-00-00 FOUND ENG NR 1 BLIND CAP SEAL LEAKING. R&R IAW AMM 72-51-41. LEAK CHECK GOOD. DECONTAMINATION OF ENVIRONMENTAL SYSTEM REQUIRED.