I have a I have a Kurzweil 88 PC. Nothing on the right channel works. The right out Channel is out, I do not get the right channel on my headphone, even on the left Channel /mono Jack I do not get the right side. Everything comes from the left side. What does that mean? Took it to a tech, he said the right channels totally blown. Anyway I can fix this, so at least I can get stereo from the headphones?