LRE30453ST/02 Oven temp.

So, my oven will not come up to temp. Broil will work, but bake will only come up to around 200 degrees. I changed the thermostat, that didn't help, and had some one with little experience look at it. He says some board needs to be replaced, was not specific at all. If some one could tell me witch board it sounds like needs replacing, and where I can purchase it at a reasonable cost, I would greatly appreciate it.

via LRE30453ST/02 Oven temp.
by njm9477