I took a look around youtube for some how-to vids and found a few that weren't the greatest. This one seems to be better than most (but it is a full diasassembly vid)http://www.youtube.com/watch?v=Y-35mUbeQnQ
Hopefully it will help some - watch the video through a few times - you may find that you do not have to do as drastic as complete disassembly (you might have to though).
Also gonna link you to the support page for your laptop herehttp://support.ts.fujitsu.com/Index.asp?LNG=COM
I looked for but could not find a service manual (some manufacturers have them on-line) which would also be helpful.
hope it helps, good luck