I've had this kiln for a few years , never used it till now. Decided to use it, giving my other kilns a break, lol, fired 2 loads through it great , worked on low,med, high and now it won't operate but on high, leaving 2 element none working. The light wouldn't even come on when turned to low or med. I took the sitter apart and cleaned the contacts. The lights come on now but elements will not heat up. Checked them, they are good. What's the chances both switches went out, kinda stumped here due to it not having relays ?