What was found
FAS REPORTED NOTICEABLE "DIRTY SOCK" SMELL IN FORWARD CABIN FROM 15 MINS OUT TO LANDING // PERFORMED TSM 05-50-00-810-831-A. ISOLATED BOTH PACKS WITH ENG 1, ENG 2, AND APU. UNABLE TO DUPLICATE ODOR IN CABIN. NO DEFECTS NOTED. OK FOR SVC.