Product review (5 stars): Remove bad parts and put new part in (there is a ...
Saved me from having to buy a new microwave.  By the time I would have paid someone to come out and fix it, I would be 1/2 way to a new microwave.
Mature Pro tip : )
1.  Remove two screws on top of microwave to slide the top vent over and off.(door has to be open)
2.  Unscrew one screw that you can see to the left of the key pad when the door is open
3.  Ground your self so you don't short the electronics out and take a picture of the cables
4.  Remove the cables (some you need to pinch and left others pull right off.
5.  Remove the screws holding the board down
6.  Remove bad parts and put new part in (there is a slant to the outside so there are two buttons taht are longer than the other two.  They go to the outside of the microwave (deeper part if I am remembering wrong.)
7. Put the plastic peace in (there is a hole so you can line up w/ the plastic spike.)
8. Put the touch pad back  on.
9. Reassemble
10 Bob's your uncle