Marzocchi Bomber EXR

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hi, i have just got a new bike and it has a pair of Marzocchi Bomber, EXR Comp forks i think,
although they stick when they go down or stay down if that litle switchy thing is turns
how do i tighten them up and whats the little switchey thing on the too
thanks in advance

http://www.marzocchi.com/template/listSPAFAQ.asp?IDFolder=159&IDCat=2737&LN=UK&Sito=usa-mtb

http://www.marzocchi.com/template/detailSPAFAQ.asp?IDFolder=159&IDOggetto=2790&LN=UK&Sito=usa-mtb&mCO=&mCW=%23DQG%23weoRjjhwwl1Lqwhur4%23%40%235%3A6%3A&mCJ=%23LQQHU%23MRLQ%23weoRjjhwwl%23DV%23weoDuhd%23RQ%23weoRjjhwwl1Lqwhur4%23%40%23weoDuhd1LGRjjhwwr%23

http://www.marzocchi.com/Template/listSPAManuals.asp?IDFolder=126&LN=UK&Sito=usa-mtb&t=EXR&TipoProdotto=ForksOE&IDA=&Submit=Search

yeo seems like the o rings needs replacing
is there anyway i can get this done DIY pr at a normal cycle shop
andi s it exoensive
cheers agen