Lower Heating Element not working

The oven is a Thermador SCD302T double convection oven. The lower heating element in the top oven does not heat up at all. I have tested the heating element and that is working. I am considering purchasing the Oven Display Repair Kit (which includes the relays) part # AP4929088. A parts list online also mentions fuses… so do I need the (much more expensive) Oven Display Repair Kit? The upper heating element works, so if it is the same relay that turns on both heating elements maybe something else is causing the problem. We have had a couple power outages that may have caused some electrical issues. Thanks in advance for any help.