Searched the internet for possible causes, narrowed it down to the oven ignitor. After running the checks suggested, determined that it was the most likely cause. Went to Appliance Parts Pro to locate the correct part ( site was very easy to use). Two different parts were shown, so I used the on-line chat to determine the difference in the two items. One came with a shield attached, the other was without a shield requiring you to utilize the old shield on the ignitor. Ordered the part without a shield. Replacement was relatively easy, after viewing the video available. Wife now has her oven back.