Ciao!
To tell you my experience, I have been able to find all of these, i.e., buttons, a very few CEM3374's at the eBay and even a 'new' unused Xpander display! So it is not absolutely impossible. Rotary encoders can be replaced and there is a replacing display unit about on the market. As far as I know, buttons, displays, encoders and especially the 3374's has been sold out during the last few years, but you may still find single or more components at eBay, if you follow it regularly enough. Searching any of the components on this forum, will give you some more hints. As has been told, however, the quickest way to get spare parts is to buy a broken Xpander or Matrix-12.
Tiitu
