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There are several fans on this oven so you first need to determine which fan is making the noise. If the noise is coming from inside one of the ovens and it stops when you open the oven door, then that is your convection fan motor. You can sometimes remove the back panel and bend the fan blade straight if it's gotten warped from the heat over time. Other than that, if your cooling fan is making the noise, that is located behind the entire oven. The entire double oven would need to be un-installed and the back sheet metal panel removed to expose the cooling fan motor so that you can replace it.
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