As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR ON DESCENT STARTING AROUND 25,000 UNPLEASANT MUST GYM SOCK SMELL-PERFORMED TSM 05-50-00-810-831A. INSPECTED PACK# 2 FOR CONTAMINATION. NO EVIDENCE OF CONTAMINATION FOUND. RAN BOTH ENGINES TO DUPLICATE FAULT IAW AMM 71-00-00. NO ODOR DETECTED. R&R RECIRC FILTERS IAW AMM 21-21-41. FOUND CAUSE / SOURCE OF CABIN ODOR TO BE MISC ( TYPE 10 ). A/C OK FOR CONT'D SER.