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Turn over the inner part, remove the many, many screws that hold together the metal back plate and the grey part where the keys used to reside. Remove the metal plate gently (to avoid losing the small plastic keys that press the two membranes together at a keystroke). In this case, the membranes were stuck to the metal plate because of the approx. 1 litre of beer that the keyboard had had. I did not know about that until I smelled it.