Checking back in to see if there are any other suggestions as the new board did not change the temperature control display. The fridge side is still dropping into the 30s but the door display shows 80. Freezer side works and displays properly.
Check the wires between the thermistor and the board for continuity. The board uses the information from the thermistors to tell the compressor when to stop and start. If the new board thinks it's 80° It's either not reading the thermistor correctly or the new thermistor is bad. Measure the resistance of the thermistor at the board.