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Answer to: Blue or Grey Fret Button PadBuenos días hermano, cuando dices pad ¿te refieres a la membrana de color gris oscuro de la tarjeta (PCB)?
Answer to: when I push the yellow button both yellow and blue are activatedHola heyhoy52 ¿cómo estás?, I'm from Colombia and I hope your okay, first of all happy new Solar Cycle. Probably what's causing your issue is the connection between the cables and the PCB (the board), so I strongly recommend you to chek this, look at the picture please. If it's necessary cut the first 5 or 8 millimeters of the cable and solder to the PCB again.
Answer to: My red button flickers on and off and then shuts downHola Robert, ¿cómo estás?, I'm from Colombia and I hope your okay, first of all happy new Solar Cycle. I had exactly the same issue with my guitar controller for Playstation 3, and I say I had becase fortunately I could fix it yesterday. It's really annoying to play with that kind of trouble and I just did the following and it was completely fixed, after looking for a lot the issue, I first thought it was caused for the red fret button and it wasn't. I've attached a picture where I mark with red circles the place where surely you have the problem. What I did here was to check the connection between the cables and the PCB (the board) and effectively the cable of the red fret hadn't a good connection with the board so I cut the first 5 or 8 milimeters of the cable and soldered again. As I told you before, I had exactly the same trouble as you and I could fix it in this way, I'm sure your issue is the same, so try this solution and tell me.