Replace the aging built-in keyboard.
Flip the computer over.
Remove the two 24.1mm Phillips screws near the front of the case.
Remove the five 33.0 mm Phillips screws towards the back of the case.
Carefully flip the computer right side up.
Lift off the top half of the case.
Near the motherboard, gently pull the keyboard ribbon cable until it becomes free.
Lift the keyboard out of the case.