Extravehicular Activity (EVA) #26: Today, Mastracchio (EV1) and Swanson (EV2) successfully performed an EVA to remove and replace External (EXT)-2 Multiplexer/Demultiplexer (MDM). Once the MDM was installed, ground teams powered on the new MDM, loaded software, and configured it as a viable backup. The MDM had previously failed on April 11,2014. The EV crew also …