Oven wouldn't heat. This degraded over several weeks.

1. Pulled the 110V power plug. It was not necessary to turn off the gas; just be careful not to stretch or pinch the flexhose behind the stove.
2. Removed the oven door by opening a couple of inches then lifting upward.
3. Removed the warming drawer by pulling out to the stop, then pushing the small levers on the side of the track to release.
4. Removed two flathead screws at the back of the oven to free up the oven bottom panel.
5. Removed the bottom panel by lifting up the pack until the front edge clears the overhang.
6. Removed the two screws on the side that hold the igniter to the burner tube. Be sure not to let the screws drop into the gaps in the oven floor. Note the position of the bent tab with the holes to ease aligning the new part.
7. Reached through the warming drawer to release the plug by squeezing the tabs on the end.
8. Pulled the plug up through the gap in the oven floor (where the wires went through) and connected it to the other connector.
9. Ran the new wire down through the oven floor.
10. Aligned the new igniter and tightened them. Had trouble getting the screws started so I used a toothpick to align one hole while starting the other screw.
11. Replaced the oven bottom panel. It needed a little jockeying to get the screws and holes aligned.
12. Replaced the door.
13. Replaced the oven drawer.

This turned out to be a good time to clean all those dusty places that don't get cleaned that often.