I first removed the old ignitor and tested it to see if it was reaching or exceeding the correct output amperage of 2.8A. It was not and I ordered a replacement. The installation is very simple and consisted of the following:
1. I unplugged the range and turned off the gas and then removed the door from the oven and the racks. I loosened the 2 screws securing the lower cover and then removed the 2 wing nuts holding the combustion plate.
2. You have to take out the the burner which is held in place by 3 screws. The ignitor is attached to the burner assembly by an additional 2 screws. It is recommended to place a little oil on all screws to prevent them from stripping due to the heat they are routinely subjected to. Remove the old ignitor and install the new ignitor using the existing screws and in the same orientation as the old one.
3. The ignitor has two wires that terminate in a molded plastic connector. The ignitor wires feed through the rear wall of the oven and connect at the rear of the stove where they are covered by a metal plate. The thin metal plate is held in place by 6 screws. Unscrew the panel and then disconnect the old ignitor and connect the new connector. Remove the old ignitor by carefully pulling the wires out through the opening in the rear of the oven.
4. Reinstall the burner and make sure you push any excess wires from the ignitor through the opening. With gas still off, plug in the stove and start the oven briefly to make sure that the ignitor starts to glow red. Turn of the oven, unplug the stove and reinstall the remaining pieces exactly as they were before (including the rear panel). Once complete, plug in the oven, turn on the gas and test accordingly.
I tried to make this detailed in the hope that this helps someone else. The part was about $50 and saved what would have likely been a $200 plus dollar service call.