Jenn Air Electric Cooktop 5 Burner

Used in good overall cosmetic condition Jenn Air Electric Cook top. It is a 5 burner unit, with 4 for cooking and 1 for warming. 2 problems with the cooktop: - Warming burner knob would need to be replaced as the thread has worn -Dual zone element works and heats up as designed, however, the knob would also need to be looked into/replaced as the knob does not stay depressed in when applied to the desired heat setting. Therefore, it works if you hold it in manually, but doesn't once you let go. Otherwise, the other three burners (top left and right, bottom left) all work great and were being used as of a couple of week ago before it was replaced with a new unit.