Need help on how to open up my Nespresso 897?

Hi,
I have a problem - steam is coming out the group head instead of the steam wand, I have removed all of the screws but haven't been able to get it apart. Don't want to break it getting it apart.
It is the 897 model - a link to a photo is below.

http://www.nespresso.com/precom/sima/fiche__NESPRESSO_KRUPS_897__K_C250_432_1_nl_nl.html

Many Thanks
Mark