Oven Light

This unit is Dacor’s delux dual oven 6 burn range. Both oven lights for the large oven will not come on. The light in the small oven works fine. I have checked the light bulbs (12v, 20W halogens); both are fine. The electrical schematic shows they both work off the same transformer, so it would seem that’s not that problem.

Anyone know what it could be? Relay Board? Is this a common problem? Jim :confused: