Whirlpool Duet Dryer GEW9250PW1

Whirlpool Duet Dryer GEW9250PW1
When I select control it does not power on. When the door opens light comes on.
Thermal fuse checks good. When I disconnected the interface unit from the electronic control unit and then reconnected it worked for a short period.
Is there a way to determine if it is the interface unit or the electronic control unit?
Should I be checking something else?

Why is there so much dust and lint collected in the bottom?