Expedition 32 astronauts Suni Williams and Aki Hoshide  performed an 8 hours 17 minutes spacewalk on 30 August.  However, the pair failed to install the main bus switching unit No 1 (MBSU No 1) replacement after a bolt would not drive home.  The failure to do this has meant that two of the eight main solar arrays can not be used to power the space station.  A new spacewalk is now planned.