Your range uses a hidden bake element, meaning it is located under the oven cavity. This design makes for easier cleanup of spills, but requires extra work when it is in need of replacement. Hope this helps.

Yup, the broil element is on top and visible, the bake element is hidden and under the oven liner.

During preheat, your oven will turn on and cycle both elements to get the cavity up to temperature more evenly and quicker. If your oven is taking way to long to preheat, the cause is usually one of the elements no longer working. People are often tricked into thinking because there is heat when I open the door during a bake preheat, that the element must be working. If you replaced the control due to a low heat situation, then it may be time to go back and take a some measurements to get you going in the right direction.