I have this Akai set. Supply voltages good. Two mylar caps were bad on supply but fixed and no change (very dim display, no sound). Most I've read says Ysus and maybe buffers bad. What are some voltages for the Ysus that I can verify? Like there are connects to the buffers with I think it was -38V/7V. Is this correct or way out of line? Can't find a schematic (LJ41-01192A).