After shutting off the gas and removing the oven door, which simply slid off of the hinges, I removed the oven plate. The ignitor was attached to the manifold. I removed that and noted the wires were attached back behind a hole in the back of the oven. I thought I would have to access them from the back but when I pulled on them I was able to reach them from the front. I was surprised to find plastic lugs covering the wire ends, rather than ceramic. I attached the new ignitor wires and reused the plastic lugs, as no ceramic ones came with the new ignitor. I carefully slid the new ignitor back into the cage/shield attached to the manifold and replaced the manifold. I then turned the gas back on and tested the ignitor (which worked perfectly) before replacing the oven plate. The repair took less than 30 minutes, but my wife and I thoroughly cleaned the door and interior while we had it apart. The hardest part was getting the door back on the hinges, but this too was accomplished after several attempts. The oven heats up beautifully now.
Remove 2 screws holding the top burner. Remove 1 screw holding the electrode. Remove electrode from wiring using plier. Install new electrode and top burner
Remove the two screws from the burner assembly (on top of the burner). Lift burner assembly from the cook top. Disconnect the electrode wire from the electrode. Remove the screw holding the electrode to the burner assembly (on bottom of burner). Install the new electrode and attach the electrode to the burner assembly. Attach the electrode wire to the electrode. drop the burner assembly back into position on the cooktop. Attach the burner assembly using two screws.