Freezer too cold on GE profile

Hello everyone and thank you in advance for any tips for getting my problem resolved. I have a 6 to 7 year old GE profile fridge model PSHS6RGXBDSS. Last month I replaced the motherboard model WR55X10775. Everything workd ok for couple of days now the problem I m having is the freezer temp shows -9 and the fridge temps goes anywhere from 44 to 48 degrees. I have put the temp for freezer to either +5 or 6 and fridge to 37 but neither will not go down. Now the water line is frozen too. I have seen little ice frost build up by the damper on the fridge side and freezer side as well. I have been reading online for solutions but I don’t know I’f I need a new damper or new sensor or heater I have no idea what part needs to be replaced. Any help would be greatly appreciated thank you