KitchenAid gas range/oven lower burner in oven won't light after self-clean

Hi there. I have read in many of the forums that KitchenAid is notorious for failing following a self-clean. This did happen to me; the display panel went blank and the door remain locked, despite the unit having power and gas delivered to it. I replaced the thermal fuse in the back and that solved most of the issues, but what remains is the lower element of the oven doesn't heat.

When I start the oven, you can hear the igniter clicking repeatedly. Slowly, the oven starts to heat. But ultimately it never reaches full temperature because I think the bottom element isn't working. The top element works as I can feel the heat with my hand. I have tried the oven on regular heating and convection, the result is the same. The broiler works, which is consistent with my observations that the top element functioning.

I won't lie, I'm a little freaked out about messing with a gas range. I've been told to be cautious because if there is gas being delivered to the bottom element but it does not light, there is a risk of the gas leaking. My question is, is this a job for a do-it-yourselfer, or should I call a professional? I didn't have any challenges replacing the thermal fuse on the back after watching an informative You Tube video about it (although I did have a few screws left over -- I am hoping those were just decorative)

Thanks for your thoughts! (The model is KGSA906PSS00)