I have a JennAir double wall oven model WW27430W. The lower oven is working without issue. The upper oven will work on broil just fine. However it takes a very long time to heat up on bake and convect bake, worse on just bake. The bake element is brand new. I replaced the control board (the clock) but the issue persists. I am thinking relay board but it would have to be rebuilt as it is no longer available. Before I do that I want to make sure it is the problem and find out if I should also be getting the relay board for the lower oven rebuilt as well. I just don't know if it could somehow be involved. Will the lower oven continue to work if I only remove the relay board for the upper oven? Any help would be most appreciated. Thank you.