/ H atch ▁closure ) ▁ ▁The ▁ST S - 1 3 5 ▁crew ▁returned ▁the ▁M PL M ▁back ▁to ▁Atl ant iss ▁payload ▁bay ▁on ▁flight ▁day ▁ 1 2 , ▁closed ▁the ▁h atch es ▁between ▁the ▁Space ▁Station ▁and ▁the ▁Sh utt le ▁and ▁prepared ▁for ▁next ▁day ' s ▁und ock ing . ▁ ▁Begin ning ▁at ▁ 5 : 0 3 ▁UTC , ▁the ▁h atch es ▁separ ating ▁R aff a ello ▁M PL M ▁and ▁the ▁I SS ▁were ▁closed . ▁With ▁station ' s ▁Canad arm 2 ▁locked ▁onto ▁R aff a ello , ▁commands ▁were ▁issued ▁at ▁ 1 0 : 1 4 ▁UTC ▁to ▁begin ▁the ▁re le asing ▁operations ▁of ▁the ▁ 1 6 ▁motor ized ▁bol ts ▁holding ▁the ▁M PL M ▁in ▁place ▁on ▁the ▁station ' s ▁Node ▁ 2 . ▁Arm ▁operators , ▁Mission ▁Special ist ▁Magn us ▁and ▁Pil ot ▁Hur ley ▁working ▁inside ▁the ▁cup ola , ▁un - ber th ed ▁R aff a ello ▁at ▁ 1 0 : 4 8 ▁UTC ▁and ▁moved ▁it ▁back ▁to ▁Atl ant is ' s ▁payload ▁bay . ▁The ▁move ▁was ▁completed ▁by ▁around ▁ 1 1 : 4 8 ▁UTC . ▁The ▁se cur ing ▁of ▁the ▁R aff a ello ▁in ▁the ▁sh utt le ' s ▁payload ▁bay ▁marked ▁the ▁ 1 0 th ▁and ▁final ▁transfer ▁of ▁an ▁M PL M ▁in ▁the ▁history ▁of ▁the ▁Space ▁Sh utt le ▁program .