Hello from Estonia to here to.
Well, i am more than familiar to soldering but the question is, what chematics in first post's link should i use, as if my radio is audi original car stereos, i have 3 of them in my hand, all of them have volume button faults, 1 have *fixed* one of them but i want to get the code out to, and i deffenetly want to soldier the components onto the plate myself(i'm more diy guy*
PS: Sorry for grammar misspelling, still learning the language.