I have a GL2 I am working on - return 4 is not passing any signal. Resoldered the jack connections first but that did not solve the problems so I pulled the board that the returns plug in - and checked it over, capacitors all had quite high ESR so I recapped that board, but still no return 4. I realized that the returns plug into one board and then go to another board so I need to trace the lines and see if I can track it down - schematic is a little difficult to follow with all the boards…
Figured it wouldn’t hurt to post here and see if anyone has any ideas on where the problem might be?