Thank you all for your posts and sorry for not responding sooner. I replaced all the wiring and speakers and amps. It now works fine.

I also think I figured out how the system went out. It was the CD player that was the beginning of the issue. It started putting out low volume tinny sound about 4 months ago, client didn't call me they just kept uping the master volume and finally left it on 10 (11 if you like spinal tap) for months. I think it slow cooked all components which is why I couldn't get any combination of tests to work. Even though we replaced the wiring, we didn't need to redo the wiring but speakers, amps and music source had to be changed. At least that's what I am guessing on it.

Thank you again because your posts were all correct. My mistake was trying to figure it out for longer than I should have.

Systems>Process>Service>Success