What was found
FLT 669. JFK-SJC. ON T/O ROL (FLEX MCT PWR APU OFF) A STRONG DIRTY SOCK SMELL NOTICEABLE IN COCKPIT. IT DISSIPATED BY 10K' MSL. FWD GALLEY NO SMELL/ODOR. AFT GALLEY VERY STRONG WHICH DISSIPATED BY FL200. NO CUSTOMER COMPLAINTS CABIN ODOR REPORT FILLED OUT. ON APPROACH PROFILE INTO SJC PASSING THROUGH 8000' THE SMELLY SOCK SMELL RETURNED TO TOUCHDOWN. APU WAS OFF; ACCOMPLISHED INFO NOTICE 2017-T015D. UNABLE TO DUPLICATE ON GROUND. THIS IS CONSIDERED A LEVEL 1 EVENT. A/C OK FOR SVC. NOTIFIED MCC VINNY.