Discussion about the Korg PolySix synthesizer

Greetings folks. My first post to this marvelous list and I'm hoping 
for a bit of info.

I've just bought a Polysix, have opened it up, the battery has 
already been removed & there are signs of corrosion. I'm aware of the 
instructions at oldcrows.com but I'm just wondering what improvements 
I can expect.  Neiter my pitchbend or MG wheel are currently working 
and many of the knobs and switches aren't working (VCF Cutoff, EG 
Intensity, complete EG section, MG section works in VCA MOD only, 
PW/PWM & PWM Speed).

I presume some of the chips need replacing but are any of these 
problems likely to be associated with battery leakage?

Thanks very much!

Ben.