Thermador PGR364GL Oven will not lite

The problem is that the oven will not lite. I replaced the oven igniter, but that was not it. Per Thermador it is either the bake ignighter part # 0602 or #0603. Do you know which it might be and how to get to it? I am hoping that you do not have to pull the oven out to get to it. Thanks for your help!

Hi.

Do you get any fault codes (the indicator lights above the oven control knob blinking)? What is the sequence?

Thank you. Post the results.

Simon.