I don't know the X13, but I have lots of experience with old Thinkpads. Keyboard replacement really used to be super easy: Turn Laptop over, look for the screw

I don't know the X13, but I have lots of experience with old Thinkpads. Keyboard replacement really used to be super easy: Turn Laptop over, look for the screw holes with a keyboard icon next to it, remove those screws with a Phillips size 1 screwdriver, flip over, open lid, slide keyboard up and lift out, unclip flex cable, then do the reverse steps with the new keyboard. After a while, Lenovo started using more clips and fewer screws and things started to go downhill from there.