What was found
FLT 878, LAS-BOS. ****DISPATCH CONCURRENT MDDR, CALL MOC PRIOR TO RESOLUTION**** DIRTY SOCKS SMELL IN COCKPIT ON CLIMBOUT PASSING 10,000'. USING" ODOR RECOGNITION AND ISOLATION GUIDE" CROSSFLOW VALVE WAS SHUT AND PACK 1 WAS TURNED OFF. FUMES DISSIPATED. (PACKS - SINGLE (SPEEDBRAKES OK) (N503-N665) ); ACCOMPLISHED DECONTAMINATION OF ECS IAW AMM 21-00-00-615-002-A. NO FAULTS NOTED AT THIS TIME. MX-4 UPDATED. PLACARD REMOVED. MDDR# 399275 CLEARED.