microwave caught on fire

I forgot to place my dish in the mircowave and it ran for a few minutes, sparked and started on fire. I thought the whole mircowave was going to need to be replaced, however a repairman told me with just a part replacement, I didn't need a new microwave. I could do it myself and save a $75.00 housecall. I checked on line for the part he recommended and the parts were much cheaper through Parts Select than the GE website. It was a very simple repair. I unscrewed the old part and put in the new one. It took less than 5 minutes.