▁on ▁E T - 1 3 8 ▁was ▁ordered ▁after ▁engine ers ▁found ▁string er ▁cra cks ▁in ▁the ▁tank ▁used ▁for ▁Disc overy ' s ▁ST S - 1 3 3 ▁mission . ▁Techn icians ▁finished ▁all ▁X - ray ▁sc ans ▁of ▁the ▁string ers ▁on ▁ 2 4 ▁June , ▁well ▁ahead ▁of ▁schedule . ▁After ▁analyz ing ▁the ▁results , ▁they ▁found ▁no ▁issues . ▁ ▁Pay load ▁can ister ▁ ▁The ▁ST S - 1 3 5 ▁payload ▁can ister ' s ▁move ▁to ▁La unch ▁Pad ▁ 3 9 A ▁began ▁in ▁the ▁night ▁of ▁ 1 6 ▁June . ▁The ▁can ister ' s ▁lif ting ▁up ▁of ▁the ▁pad ▁structure ▁to ▁place ▁it ▁into ▁the ▁clean room ▁happened ▁on ▁the ▁next ▁day . ▁Techn icians ▁at ▁the ▁launch ▁pad ▁closed ▁the ▁Rot ating ▁Service ▁Str ucture ▁( R SS ) ▁back ▁around ▁Atl ant is ▁to ▁gain ▁access ▁to ▁the ▁orb iter ' s ▁payload ▁bay . ▁The ▁payload ▁bay ▁doors ▁were ▁opened ▁on ▁the ▁night ▁of ▁ 1 8 ▁June ▁and ▁the ▁cargo ▁was ▁installed ▁into ▁the ▁sh utt le ' s ▁payload ▁bay ▁on ▁ 2 0 ▁June . ▁ ▁Terminal ▁count down ▁demonstr ation ▁test ▁The ▁ST S - 1 3 5 ▁crew ▁then ▁tra ve led ▁to ▁Kennedy ▁Space ▁Center , ▁arriv ing ▁in ▁T - 3 8 ▁training ▁j ets ▁just ▁after ▁ 1 7 : 3 0 ▁ED T ▁on ▁ 2 0 ▁June ▁to ▁take ▁part ▁in ▁the