left channel goes out of Akai 255 tape deck

I've checked c11 and c20 and both sides the levels are very close. I am not sure where to move on from here.

I poked around with a nonconductive pen and tried to get the signal to change but couldn't get any changes in the distorted signal. I thought if I hit a bad component I could hear a change but no changes.

There are places on ebay that will sell restoration kits for the gx-255 at $165 but that's just a shot in the dark hoping that I replace the component that is bad. What do you think about that strategy?
 
I've checked c11 and c20 and both sides the levels are very close.
And that was using the procedure I outlined earlier checking on both channels?

...........tried to get the signal to change but couldn't get any changes in the distorted signal.
If you used a sine test signal could you see any distortion on either channel at C20. If you can't and each channel had similar levels and similar looking signals then your issue must be after that point.

There are places on ebay that will sell restoration kits for the gx-255 at $165 but that's just a shot in the dark hoping that I replace the component that is bad. What do you think about that strategy?
No way to fix anything imo 🙂
 
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I am giving up the ghost on this machine. Way too far gone for me to fix it, and sending it out to fix will cost more than it's worth. I am putting it on ebay as a parts machine and hope to get my money back out of it. Thanks for all the help you guys have provided. Now I am going to work on the Dokorder I bought at the same time. It's a much simpler machine.