Lower oven lower electric element

It's a straightforward remove and replace with two screws. The lower element is most likely to go with years of baking when bake pans overflow on to the element, It can be checked with an electrical probe for resistance and continuity. If the oven is preheating and the lower element doesn't heat that is definitive. We had it checked under the extended warranty but the tech wasn't thorough enough. The extended warranty is of questional value.