Twin Famicom controller repair/replacement?
Hi all, quick question about the twin Famicom. Pictured is my system, if that helps. Recently I noticed that my player One controller works, but doesn't seem to read diagonal inputs well at all. In any direction. I picked this up a few years ago on ebay, and it was claimed to have been fully refurbished/service with a new belt etc, and I believe that because it was in such good condition. I haven't had any issues with it, and the only reason that I'm noticing this issue now, is because I don't play a lot of games that use diagonal inputs. Usually just Mega Man 2 on this thing if anything. But now I'm noticing that also up on the d-pad I have to push kind of hard.
I've never had any major issues with Nintendo controllers on these old systems, but now I'm wondering what the best way to go about fixing it would be. Should I open it up and just try to find a replacement controller board to put inside of it, or is there something that I can do with the actual controller boards to fix the issue? Ive already taken the xontorller apart and cleaned the contacts with 98 percent alc, and no change.