Sansui TU-555

[Culprit]

Good Morning all, I have a vintage Sansui tu-555 with the left side output being like 80 percent quieter of what the right side output is. I have the schematic along with pictures. I have tried looking at the schematic but it is very hard to read. I am assuming this will need a recap. Any advice or anyone that can tell what is wrong?

Here is a link to the pictures:

https://imgur.com/a/eKdrBcO

Any help would be greatly appreciated.

 

[Culprit]

I have treid turning the pots to no success.

 

[Punker X]

Do you have an o'scope you can signal trace with? Would help in isolating the area where the problem is. Assuming you have clean the controls and switches with deoxit.