I bet that almost all of the plastic parts can be printed and replaced if they have been damaged or have been broken. Unfortunately I couldn't find any 3d models of those parts. There is a 3D scanner (Artec Eva unless I'm mistaken) in our head office and they can let me use it to make some 3d scans of plastic components.
However I can't get acces to 3d printer and I don't even imagine how to use it.
Well, that's my idea to make 3d scans and print them.