After trying to get our Norcold 3 way refrigerator repaired and having Oliver service center look at it twice. The service center quoted us a price of $4800.00 to replace the Norcold with a Dometic 12 volt compressor unit. I decided to try to repair it myself. The power board is easy to change it is the one accessible from the out side lower panel. That didn’t fix it. So I changed the optical display board next part number 628663. This board is located behind the front panel of the refrigerator. This board didn’t fix it either. Next I replaced the front button control panel part number 630619. The fridge is working properly now. I purchased these items on eBay. The removal of the front panel was the most difficult of this process. Message me if you would like an explanation of how to remove the front panel.