Kenmore Refrigerator Is Not Cooling?

Our Kenmore refrigerator with a bottom freezer is not cooling (either one). We began seeing water come from the bottom of it. We purchased it June 2012 and had a Kenmore appliance dealer come out to evaluate it. Unfortunately, we had unplugged the appliance and were not told prior to make sure it was plugged in. They couldn't test to their fullest potential being it was not plugged in for several hours. They did comment that they have seen more and more Kenmore appliances 3-5 years old that have a line inside that is plugged. To get to it, would cost approx. $600-800. Any comment, would be appreciated. Model: 795.72034.111