What was found
@ 3000' ON FINAL APP WE GOT FUMES SMELL OF DIRTY SOX IN FLIGHT DECK. ON GND SWITCHED TO APU BLD RIGHT AWAY AND STILL HAD SMELL. SHUT DOWN #2 AND STILL HAD SMELL TO GATE. (NO SMELL IN BACK FOR FA'S) // CHECKED ENG 1, ENG 2 & APU FOR CORRECT OIL QUANTITIES AND FOR SIGNS OF LEAKAGE, NO LEAKS NOTED. ISOLATED PACK SYSTEMS & AUTO STARTED ENG 1 & ENG 2 INDIVIDUALLY PER AMM (CONTINUED ON LP 879913-2) 71-00-00-860-823-A. NO ODORS NOTED IN CABIN OR FLT DECK. OK FOR SERVICE.