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Your problem is most likely one of the door switches, or the plastic holder for the door switches.
This located behind the touchpad just to the left, after taking top and sides of the microwave.
Link below will show you the holder.
Link below will show you door switch, you unit takes 3 of these.
If you order the 3 switches and the holder, this will take care of it.
I have to remove cabinet? How do I confirm the parts are faulty?
Ok if the holder is bad should be broken off or cracked somewhere in plastic not keeping switches in place.
As far as the switches you would use an OHM meter to perform continuity test.
If you have any other questions,just let me know.
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Do I have to remove the cabinet to confirm the switch is working. the holder is not cracked or broken.
Well if you can get the meter leads on the switches you can. Should test one way with door open and different with door closed.