I've replaced the power button board two different times and every time, the power and volume down buttons would work but the volume up button still isn't working. I think it's some kind of software malfunction or something like that but I also tried factory resetting my switch and that didn't work. This person ([post|618506|new_window=true]) asked a similar question 3 years ago and never got an answer so I think this problem is a lost cause.