Yamaha CS80

I mentioned that one of the problems that has me stumped on the CS-80 I'm working on is 
that in channel one's panel mode the oscillators will not turn off. Everything else seems to be 
working in panel mode, noise, filter, envelope, etc. I also tested it in the memory section and 
if I select a patch there and turn both oscillators off with the little mini selectors they still 
sound. This leads me to believe that it is something more global since it is both in the 
memory selectors and the panel mode. In panel mode for channel two they work as they 
should. Any ideas?