Have a Jenn-Air SVE87600 oven with convection cook option. The convection fan will not activate, but the oven heats in this mode. The bake and broil options still work. The touch buttons beep when pressed and appear to be activating controls as appropriate but the display is always dark when the oven is off and only occasionally lights up after the oven cooks at a moderate heat for at least an hour (then it may be dimly lit). Timers cout down, but again, can't see the display, only hear the alarms. Any recommendations? Have seen many complaints regarding control pannels. thanks