Korg Poly800/EX800 Users

Hi,

I've just joined this group.

I own a beaten Poly800 and I enjoy it a lot.
However I have no clue on how to do maintenance on it.

There is a small battery inside the synth which would need to 
replaced. Is there a "right" way to do it. Is that kind of battery
readily available? Is there a chance that I would lose my "custom" 
made sounds by doing so?

Also,
I have converted the available TIF files on this present site to a 
single PDF file (about 4megs).

Would anyone be interested in the upload of such material to 
the "files" available on this poly800 site?

thanks,
koreanmotobecane