My Frigidaire FGHS2631PF4A recently stopped working. It was sudden and only noticed when kids were trying to get ice. We have tested the power cord (120 volts), the run capacitor (we figured out we were way off base here), replaced the main control board (getting power and tested 14 volts to display interface), recently ordered display interface because it has 0% function and no lights. So were getting power, controller is getting juice but have no lights on the display or interior lights and it doesn't get cold on either side. What is everyone's opinion on what part I actually need here?