Kaypro II keyboard fault / keyswitches wanted

Hey all, I snagged a Kaypro II a short while ago which I finally got around to looking at. After some minor TLC to the drives, it's booting. However, the keyboard appears unresponsive. Pressing keys (with the exception of caps-lock, the two shifts, and ctrl) results in a buzz/click from within the keyboard - if I'm interpreting the schematics right, the click is actually driven by the system in response to a keypress, which suggests that my keyswitches are OK (I believe these use a foam disc approach, which are prone to deterioration) and that keyboard data is being received OK (at least on some low level). Any suggestions for possible things to investigate? It doesn't feel like a memory fault, given that it's using 64kx1 ICs and booting as far as a prompt, but I suppose it's possible. On the back of this, I'm in need of three keyswitches, if anyone happens to have a parts machine and would be willing to sell any. A student of the machine's previous owner dropped the keyboard years ago and broke three of the keys off. I have the keycaps, but the switch stems are broken and it would probably be easier to replace the entire stem portions rather than attempting to glue things back together. cheers Jules