We have a Jenn-Air double oven and the clock display has gradually gone faint and now at times we're barely able to see the clock or oven temp. The oven continues to work fine. The oven was in the house when purchased, so not sure if there is a light in the display that needs to be replaced (never heard of this happening in other ovens) or if there is a wiring problem. Anyone have an owner's manual or familiar with this issue?