I have a GE Monogram single wall oven that went dead. Model# ZET1PM1SS S/N# MS6017800. When I turn the breaker on, I get 3 dashes on the temp display and the clock starts at 12:00 but nothing else works (oven, light, buttons). I was able to hold down several buttons simultaneously and got it to display \"F8 Prod\" and then the oven light worked and I could even get the convection fan to turn on but the oven is still dead. I was also able to get the screen to display \"F8 47 1616\" I am assuming it is either the relay control board or the power supply board. Any advice which it is? Or is it something else?