@som99
WD-40 will fix those switches and potentiometers. There's a good chance you won't need to replace them - if you use WD-40.
I've bought plenty of pots back to life with WD-40. Don't ever use switch cleaner on a pot though, as it will fix it at first but then a few days later it will be 10 times worse than it was.
Of course, a pot with a totally worn-through track isn't any good, but unless it's had a really hard life then this is unlikely.
