From where it is, I'd say remove the wheel well liner (pull little plastic plugs) and then unscrew the black plastic pieces underneath the front of the car. You may also have to remove the battery and the battery tray to get to some bolts. Doing both of those will guarantee access, although I'm not sure exactly where all of the bolts and such are located.
This thread from GAGT.com has some pics that give you a good underside-view when you remove the plastic parts:
http://www.grandamgt.com/forum/showthread....&threadid=18146
Oh yeah, I don't know if you've done a CAI yourself. If not, find a thread about CAI install as far as how to remove the wheel well liner and the other stuff.
Let me know if you want some pics, although if so I won't be able to get some until tomorrow night.
This thread too:
http://www.grandamgt.com/forum/showthread....=&threadid=3737. Are you sure it's not the pump instead of the reservior? Depending on the collision and all...either could be the problem. They say how to check the pump in that thread, too. Cracked pump housing seems to be the same as cracked reservior....Good luck! :thumbsup: