Product review (2 stars): One defective, replacement module works for two burners. Too weary to try again.
One of the burners on my GE Profile range would not ignite-- clicks but no ignition. I ordered one and replaced it. Unlike other ranges where the spark module is accessed through the rear panel, the designers of this particular oven had the "kindness" to put it UNDER an access panel UNDER the burners. To get to it, you have to take the front control panel off, unscrew the nozzle assemblies (I don't know official name) from the cooking surface, remove spark electrodes, unscrew top from front panel mount assembly, open access panel, and then remove two screws to release a bracket that holds the spark assembly. Looking at the youtube videos of how to replace the spark module, I thought this was going to be an easy job. Not on my GE Profile. Thanks GE designers. In fact, I could not find a youtube video describing how to access the spark module for this type of stovetop range-- I had to figure it out as I went along.

Furthermore:
1) The first spark module I was sent was dead. After I put everything back together, I had a tremendous sinking feeling as none of the burners would ignite. No clicks, no sparks. Worse than before. You know the feeling. I was wondering if I had forgotten something or broken something. Using an educated guess, I thought I could directly test the spark module by putting 110V AC directly into the spark module. I did this on the old module and it clicked and sparked. I took the range apart again, took out the new spark module and did the same. No clicks and no sparks. Put the old module back in and returned the defective module. Broke one of the spark electrodes-- the expensive, $17 one.

2) Received replacement module and ordered a new electrode-- still can't believe that small piece of metal and porcelain costs $17. Put everything back together and now two of the burners work. Fortunately, its the back two burners that don't work. They click and when I close the gap to the spark electrode with a screwdriver, they do have s weak spark so I know the wiring and everything else is OK. I think its just a weak spark being generated by the module and I am not inclined to tearing down yet another time. I'll have to do with a lighter for the times we use the back burners for a while.

TL, DR: first module did not work at all, second module works for two burners.