Lincoln 1301-4 oven. All of the fans work, the conveyor works, the oven just stopped heating. The oven is not crucial and has been taken out of service but I would like to get it running again. I have salvaged parts out of other broken ovens to get the conveyor working but trouble shooting the heating has me a bit stymied. I have the service manual and have some new and salvage parts available, just would like to know where to start and if I have the parts I need.