Korg Poly800/EX800 Users

As some of you may have read in my previous post, My Poly 800 has 
been gining me problems. First the receive channel started to display 
P1 instead of 11. The next time I turned it on, the patch memory was 
blank. At this point, it seemed unprogramable as well. Since then, I 
have replaced the internal 3V battery but that didn't seem to do 
anything. I think one of the circuits went bad or somthing. Anybody 
got a clue as to what I can do to fix my synth? I really miss my Poly 
800:(

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Well id does make sounds, but won't except patches through the 
tape interface and the memory clears each time I power down.