Vintage Synth Repair

Hey
As you might guess, battery leakage. The DCO1 is dead. And the 
polyphony is lame. Every sixth note plays false sound [too high 
cutoff and...just different]. I guess the voice 6 section on the 
voice board is OK and the problem is on the CPU Board [KLM 475B] 
because of the leaked battery. Any suggestions where to look for the 
culprit? I'm not a technician, just a hobbyist. I checked the traces -
the current flow is OK. No obstacles.
Of course the old battery is removed and the traces are cleaned and 
replaced with new wires.