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I had quite a few of the keyboard letters/numbers, spacebar and end call not functioning. Since I had the phone apart I decided to spray all of the keyboard white area and all the gold contact points around the perimeter with an electronic contact cleaner and wiped with a Q-tip. Reassembled it and - WOW - everything worked again. Thank you for the guide.
This article describes removing the keypad button set and shows/describes nothing of replacing the keyboard electronics which controls the functionality of the keypad buttons. The keyboard electronics are on the reverse side of the motherboard assembly as seen in step 7. They are sealed beneath a sheet of plastic that contain a set of contact pads for the keyboard button set.
Most problems with this keyboard are likely associated with certain keys not functioning at all or responding in ways other than that intended. Repair/replacement looks improbable.