So this means to repair your broken keybaord, you can just buy a working X220 keyboard and put it in, repair cost around $ 40. Disassembly instructions: https://deskthority.net/photos-f62/lenovo-thinkpad-usb-keyboard-with-trackpoint-aka-sk-8855-disassembly-t9556.html 8 screws to unscrew. Be careful ...

It's expensive because it's not produced any more and you can buy it in only a few places. But as I wrote on https://www.reddit.com/r/thinkpad/comments/7u2ums/looking_for_lenovo_sk8855_external_keyboard/ $ 87 on AliExpress: https://www.aliexpress.com/item/New-Original-for-Lenovo-Thinkpad-Latin-Ameri...