If the oven burner would not light but the broiler would this indicated that the safety valve is OK. Problem had to be with the igniter. Removed the bottom panel in the oven and restarted the oven. The igniter would not glow at all. It should be brilliant red.
This is where the problem came in. I could not find the location of the model on the Kenmore range anywhere you would normally look - the back, the wiring envelope, the oven door jamb etc. Also the igniter cannot be removed from the burner without removing the burner from the oven.
The some of the burner mounting screws and the electrical connector are underneath the oven and the drawer needs to be removed to do this. When the drawer is removed the model number tag is visible and then you can order the correct part.
Removing the burner is simple. Remove on screw at the front of the burner inside the oven and two screws underneath and unplug the igniter. The burner pulls up and can be removed and the igniter can be replaced after removing two screws.
Reinstalling the burner was easy but the electrical connector would not mate even though the connector on the igniter looked identical to the original. It turns out that the pins inside the connector are female instead of male as in the original igniter. The easiest thing to do is cut the connectors off the igniter and the oven wiring harness and use a pair of crimp connectors (butt splices) to make the connection.
I turned the oven on and the igniter glowed brilliant red and after a few seconds the safety valve opened and the burner lit.
After shutting it off the drawer and bottom panel were replaced and the wife made some cookies.