How do I remove the keyboard from a 7890A?

We have an old 7890A with a good keyboard and an operating 7890A with a bad keyboard (some of the keys do not work). I would like to swap the keyboards. I have removed the side and top panels and I can see 3 torx screws, but I can't see any way of accessing them. They are blocked by the black column that I think is the GC frame.

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