My problem is the same fuse blows when door is open when running. I determine the problem is the bottom switch because when I pulled gently on the handle of the microwave, I can hear it click. I was able to isolate the problem to the bottom switch by holding the bottom of the door and pulling on the top. When I held the bottom of the door, the fuse would not blow. My fix was to use a soldering iron and heat up the top of the bottom latch where it hits the micro switch. Then I would use a zip tie and hot weld to add more nylon to the switch, increasing its thickness by a millimeter. After five fuses and vary frustrated family unable to use their microwave. It turned out to be a simple fix. Hopefully this helps somebody out there.