More than likely you'll end up replacing the motherboard on the back side of fridge (P/N WR55X10109) but first inspect inside rear back wall of freezer compartment for a frost buildup... This will result from the system not defrosting properly and disrupting airflow to the fridge side... Remove the cover to expose the evaporator and use a hair dryer to melt any ice buildup... This will correct your problem but only temporarily until it can be determined why the system isn't defrosting...
kooler
December 2007