We had the same problem with our Kitchenaid side-by-side about 8 years ago. Freezer was working but the refrigerator stopped cooling. After some head scratching, going over the schematics, troubleshooting, thinking about buying a new one, and a bit of
ing about stuff not lasting, I diagnosed it as being the actuator that opens the blend door between the freezer and refrig compartments. The actuator opens the door to let cold air from the freezer cool the refrig compartment. I ordered the parts from Whirlpool (makes Kitchenaid) I installed the parts and it's been working well ever since. I had to defrost the freezer then take the inner liner of the freezer out to get to the actuator/wiring but, it wasn't to bad of a job. I opened the blend door a little and jammed a screw driver in to keep the thing working while I waited for the parts to arrive. (We're used to doing this kind of stuff on our old iron, right?) This gives you something else to check to make sure this is/isn't the problem.Mark.