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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The sound is likely contacts that are unable to carry current in the element circuit. Does it heat right away when turned on?
I suspect the switch that is buzzing will need to be replaced. Can you tell from which one it is coming from for certain?
You will probably have to pull the ovens out and remove the top access panel.
I think it is the contacts in the one of the switches that the current in the element circuit goes through. So, it could be any of them. Are you certain it is not a cooling fan type noise?
You would have to replace if the contacts are making noise, they will be burning out soon.
Once we find what exact part is making the noise we can look at the parts availability.