My refrigerator --Amana "20", circa 1990--is leaking water profusely from under the freezer. That is, through the light fixture and air fins in the "roof " over the refrigerator compartment. This water is freezing on the refrigerator shelves. The drain pan at the bottom of the refrigerator is dry and I tried squirting water/bleach and air into the drain plug and even running a sink drain clog wire into it. There doesn't appear to be any blockage. Is my refrigerqtor shot or is it repairable?