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The top oven may just have a tripped high limit thermostat, that is mounted to the back wall. The bottom oven may have a bad bake element or bad relay on the board. I would check the high limit on the back wall on the top unit and then check the bottom bake element as that is really common.
It is mounted on the back wall of the unit, you need to remove it from the cavity and then remove the back panel to get at it. It is a pain,