Yamaha CS80

A friends CS80 just went out of tune on the lower part only. All voices jump up and down more cents than is pleasing to the ear, but still within a semitone. Upper part is stable and nice. My friend said he smelled somthing burnt, but I haven't been able to check anything personally yet.

Any ideas what could be the cause of this? SH-board sends same voltages to all M-boards, but is there anything in between there that could go astray?

Thanks,


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