Kenmore 80412 Microwave Oven "food fights" Questions

Noise/humming while cooking; especially popcorn; intermitent on other food I have a Kenmore over the range microwave that I purchased in 6/6 and have had it about 1.5 years. Model 761.80523500 (#80413

...they sent this but let's put it in anyway...new part for you''. After he left we went to heat up food and it sparked. We called right away and he came back out. He said it looked like it might be ...