No spark at top burners, first one then eventually all 4.

Most of the repair time was spent researching the problem online, locating the spark module inside the range, and selecting the part online. Installation was easy. Key troubleshooting info for me was, if there is no clicking, the spark unit is probably worn-out. I traced the ignition wires from the burners down to the spark module, located inside a 2x3" metal housing next to the bottom drawer. I removed 2 screws and out it came. The replacement unit pictured on the PartSelect site was not identical to the original but had the same number of contacts. I ordered the part and it arrived a few days later. The old connectors slipped easily onto the new pins, and I screwed the new unit into the range using the new metal housing. All 4 burners now spark up quickly, and we saved at least $100 on a service call. It was well worth the time and effort -- thanks!