Nothing to it. I fixed my unit this morning after reading the posts. The black part of the button is profiled as a dish to keep the two apart normally. The tape becomes a barrier between them.
Just unscrew the 9 screws, keep it with the buttons downwards, lift the board up over the pegs, which the screws fit into and it lifts out in one piece. Lay it aside carefully, ie don't drop it the window is fairly robust, then you can see the buttons, which are a one-piece item. I then cut the tape as a small square over the button. Re-assemble it carefully, do not overtighten the screws and that's it.
To put it back to normal, remove the tape and any residue using something like IPA track cleaner. David