Key only working with pad removed

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Hello,

Got a funny issue with Lenovo Thinkpad.
A key won't work/sticks on.
When I remove the pad. It's fine. Very sensitive. Even works with other things touching the key, plastic etc. Also fine.
When I replace the pad, dead. Tried diff pad on it. Same.
Take off the pad, fine again.

Any thoughts?
Rather not replace the whole keyboard - bit of a waste.

Cheers,
N*