One of the Door switches went bad, so I decided to proactively replace all 3 door switches. Make sure to order support brackets as well, as I think it's impossible to replace switches without breaking the original bracket. For a few $$, it's not worth the hassle. Interestingly, in my case, fuse that's internal to Microwave did not get blown, only main line breaker would get tripped, but I would be doing it again, I would also order spare fuse as well. Here is how I determined that door switch is bad. With MW door open, main breaker would stay ON and MW display would light up. Once the door is closed, main breaker would be tripped, cutting the power to the MW.