You may be forced to unscrew everything and look for anything thats only clipped on. You can figure it out, draw diagram or take pictures of everything so you know the correct order of where everything goes. Watch out for the floppy cable though(if you have one) sometimes the cable isnt a clip thing and you have to be careful with it and slid it in place.
After its apart to where you can access the keyboard remove and replace.
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[mind went blank]