ump ▁Module ▁that ▁was ▁replaced ▁in ▁August ▁ 2 0 1 0 ▁was ▁returned ▁inside ▁Atl ant iss ▁payload ▁bay , ▁on ▁the ▁upper ▁side ▁of ▁the ▁L MC . ▁Also , ▁a ▁problem atic ▁Common ▁Cab in ▁Air ▁Assembly ▁( CC AA ) ▁He at ▁Ex ch anger ▁( H X ) ▁was ▁expected ▁to ▁be ▁returned ▁inside ▁the ▁M PL M . ▁The ▁sh utt le ▁also ▁brought ▁back ▁material , ▁including ▁experiments , ▁in ▁its ▁mid deck ▁lock ers . ▁Since ▁ST S - 1 3 5 ▁only ▁had ▁four ▁crew ▁members , ▁astr onaut s ▁did ▁not ▁occup y ▁the ▁mid deck ▁and ▁as ▁a ▁result ▁compared ▁to ▁previous ▁sh utt le ▁miss ions ▁to ▁the ▁Space ▁Station , ▁it ▁had ▁additional ▁storage ▁space . ▁ ▁Other ▁supplies ▁An ▁iPhone ▁was ▁used ▁by ▁astr onaut s ▁to ▁log ▁experiments , ▁and ▁was ▁left ▁on ▁the ▁I SS ▁for ▁future ▁use . ▁Two ▁N ex us ▁S ▁smart ph ones ▁were ▁also ▁installed ▁inside ▁S ynchron ized ▁Position ▁Hold , ▁Eng age , ▁Re orient , ▁Ex perimental ▁Sat ell ites ▁( SP HER ES ) ▁to ▁allow ▁the ▁crew ▁to ▁pilot ▁them ▁ab o ard ▁the ▁I SS . ▁ ▁Sh utt le ▁processing ▁ ▁External ▁T ank ▁ 1 3 8 ▁( ET - 1 3 8 ) ▁was ▁produced ▁at ▁the ▁Mich oud ▁Assembly ▁Fac ility ▁( MA F ) ▁in ▁New ▁Orleans ▁and ▁arrived ▁at ▁the ▁Kennedy ▁Space ▁Center ▁on ▁the ▁Peg as us ▁bar ge