To remove the keyboard you have to loosen this little clip that holds the flat ribbon cable from the keyboard in. It's a hard-to-describe procedure but it's really easy. The socket that holds it has kind of a little hat on it that can slide up and down about an eighth of an inch. Pull up on the sides of the top of the connector with a keycap puller if you have one, or pry up each side a bit (gently!) in turn with a small flat screwdriver. The top of the connector doesn't come off, but once it's pulled up a little bit the ribbon cable will come out.

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