Nakamichi PA5

Good day gents/ ladies just in case loll,

Today I am sad have one channel louder than the other tried CD, internet etc... the same so prevision have a channel that is failing. anyone have drawings or know how to repair? Is it too costly to repair? Can I upgrade for a PA5II or higher how do «I do that please be precise in comments. And all you audiophile have a good day
If you have the skill, you can get the schematics and info on

If you want a good tech that works on Threshold and Threshold-type amps like the PA5, call Jon Soderberg @ vintage amp repair in CA.