Gas range auto ignitor issue

Hi
My GE Profile gas range is about 5.5 years old. 2 of the 4 auto ignitors do not spark. Initially, the 2 on the right side did not spark. Suddenly, one of them started to work and another on the opposite side stopped sparking. After reading posts in the forum, I gathered that either the spark module or the ignitor switch should be replaced. But I am confused as to which one? Can you please help?

Thanks