Sometimes the fix is pretty simple. If you have a humming noise or no heat, then a diode may be all you need.
We have microwave glass trays that fit most brands and models
We do more than just trays. We have other part selections such as Turntable Motors
Sometimes Turntable Supports and Wheels break too. We have a large supply of those, but they are model specific.
Filters play an important role in your Over-The-Stove microwave ovens. They need to be replaced for best performance.