Looked at unit left and middle would not heat, turn t-stat too high and was only in low flame. Adjusted t-stat on both, did not hold will need new t-stat for left and middle. Spoke to Terry at factory and got part number. -- Remove front cover, remove drip tray and remove top to get to temp bulbs. Install 3 BJ t-stats and checked operation at 200*, 250*, working properly.