Discussion about the Korg PolySix synthesizer

I'm really hoping I can get some help / advice from you all.  Ok, 
i'll state the facts once again:

My polysix fell out of tune last week, a few days before I was about 
to play a show, and I decided to get in there and tune it.  I got it 
rock solid in tune, and this is obviously where I went wrong - I had 
it plugged in still -  and closed the cover down to put all the 
screws in and saw a small flash from the center back portion of the 
inside.  It seemed like it came from the center back board that's 
screwed in with the metal plate, the one that holds the fuses.  The 
first of the two fuses blew out.  I looked around for quite some time 
to see if I pinched any wires against the case or something obvious, 
but couldn't find anything.  I bought new fuses and replaced, but 
they blow out immediately when powered up.  

I'm pretty handy with a soldering iron and such, can plunder my way 
through schematics - but not sure where to start and thought I better 
ask some advice.  Thanks in advance for any help.  The most I can 
offer this board is my patch dumps, I have a number that aren't in 
your files area.