I have a Frigidaire Professional series side by side refrigerator model #Phs69ehss1 that is blinking the number 4 in the fridge temperature display. I have already replaced the damper assembly and the control board, what else could the problem be? The freezer seems to be getting cold now but not the fridge. The first symptom was the freezer wasn't freezing and there was frost on everything in the freezer. Please help!!