[Info-vax] Info and Parts for Keyboards (specifically, LK4xx)?

[Galen]

I have an LK451 (word processing) keyboard with Ps/2 connector. I bought it cheap and hoped to get it fully working, but ran into two problems I can’t surmount without parts or some serious ingenuity.
1. Someone spilled something (a cola drink, I suspect) into it that ate away several of the  traces and contact pads on the two printed-circuit flexible plastic sheets that make up the key switches and wire up groups of them to the encoder circuitry.

2. On the elastic sheet with raised domes that serve as the key “springs”, several of the domes have been completely crushed. They won’t stay in place if you try to press them back up.

I can’t imagine that either type of damage could be repaired (but just maybe someone can prove me wrong) so I’m hoping to find replacement parts somehow.

The keyboard layouts differ between the LK411 and LK451, but I don’t know how the inner workings may differ. Perhaps they use the same plastic circuit sheets, but if so, the encoder logic must differ. I can imagine how the same elastic spring sheet could possibly be used if the keycap posts line up the same, but who knows?

If you happen to have unneeded parts for the LK451, or nonfunctional units that could be scavenged, or some othe source of parts, , please let me know. (I’m not hopeful.)