Side by Side Kitchenaid Refrigerator Evaporator

I need help troubleshooting a Side by Side Kitchenaid refrigerator model KSSP48QMS01, here is the history;

Display on the RC (refrigerator compartment) did not work, pushing buttons did not have any reaction, fridge was not functioning properly, control board replaced,after board was replaced display started working and then find out that the bi-metal defrost unit was not working either,while waiting for the replacement to be shipped I had the refrigerator running, with some