My ekiln has been acting up and I need help figuring out how to proceed. I basically only use it to bisque and it's a 4 year old Amaco (I'm the only owner). I fire to cone 08 on 'slow'. It has been firing to about 1400 degrees and then shutting off with the error message E1. I just called Amaco and they said it is either a burnt out element, or broken relay. How to I figure out which? Help!