Discussion about the Korg PolySix synthesizer

Hi-
been working on a battery-damaged Polysix CPU board;  almost have it 
back in shape, except for one problem:  the LFO seems to be 
permanently affecting the oscillators.  I checked the switch logic & 
the inputs & outputs of IC 1 (the 4066 quad switch), and everything 
is as it should be (when the LFO to OSC is turned off, the switches 
cut off as they should) -- yet, the LFO is still somehow getting 
through to the oscillators.
Any ideas? (other than buying one of Crow's new boards?)

Thanks.

~GMM