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You may have a bad transformer I have seen them go bad and start overheating. I would replace the transformer on the unit to correct that issue.
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If the heater is bad or shorted that could causes the transformer to overheat as well I would think that is the only thing I think it could be other than the transformer. There is nothing else.
The heating element is likely drawing too much current you would have to check the current draw on the unit with a meter, but honestly I would change out the element.
This is complicated to test, I can link you a service manual as you should use that or get a tech out for this issue.