How hard is it to replace control board in carrier 58wav upflow? An where to find one?

Should/might be able to find one on e-bay

Not hard to do if you know what you are doing,, but could be costly if you mess up, they`re not cheap and if you buy and DIY, you probably won`t get a warranty, and end up buying more than 1 and still paying someone to install for you,, something to think about