Whirlpool WMH2175XVB Microwave Oven "identifying different shapes" Questions

I have a Whirlpool microwave that ran but did not heat. while trying to identify the problem the fuse blew. I replaced the fuse but it immediately blew again when power was applied. what is causing ...

The Magnetron is out on our over the range Whirlpool microwave. I can get the part locally. Is this something I can replace myself? Replacing a magnetron typically is not that difficult. What you ...