▁bay , ▁installing ▁two ▁experiments ▁and ▁repair ing ▁a ▁new ▁base ▁for ▁the ▁station ' s ▁robot ic ▁arm . ▁The ▁space walk ▁began ▁at ▁ 1 3 : 2 2 ▁UTC ▁( N AS A ▁Rule ). ▁For ▁identification , ▁F os sum ' s ▁EM U ▁spaces uit ▁had ▁red ▁stri pes ▁around ▁the ▁legs , ▁while ▁Gar an ' s ▁had ▁no ▁mark ings . ▁The ▁space walk ers ▁used ▁Canad arm 2 ▁to ▁retrieve ▁the ▁p ump ▁module ▁which ▁failed ▁in ▁ 2 0 1 0 . ▁Oper ated ▁by ▁ST S - 1 3 5 ▁Pil ot ▁Hur ley ▁and ▁Mission ▁Special ist ▁Magn us ▁in ▁the ▁station ' s ▁cup ola , ▁Gar an ▁rode ▁Canad arm 2 ▁to ▁the ▁p ump ▁module ' s ▁st ow age ▁platform ▁where ▁he ▁and ▁F os sum ▁removed ▁it . ▁Still ▁on ▁the ▁arm , ▁Gar an ▁took ▁the ▁p ump ▁module ▁inside ▁Atl ant iss ▁payload ▁bay . ▁There ▁F os sum ▁bol ted ▁it ▁into ▁place ▁on ▁the ▁L MC . ▁The ▁astr onaut s ▁next ▁removed ▁the ▁Rob ot ics ▁Ref uel ing ▁Mission ▁( R R M ) ▁experiment ▁from ▁the ▁payload ▁bay . ▁F os sum , ▁now ▁on ▁the ▁arm , ▁carried ▁the ▁experiment ▁to ▁a ▁platform ▁on ▁De xt re ▁for ▁temporary ▁storage , ▁while ▁Gar an ▁clean ed ▁up ▁tools ▁and ▁equipment ▁in ▁the ▁payload ▁bay ▁of ▁Atl ant is . ▁Rec ogn izing ▁the ▁historical ▁significance , ▁Mission ▁Special ist