I have a Roper Top Freezer Model 14HDXB...1994. Last week I found water in my fridge part and now the fridge is not cooling at all. The freezer still works. In fact there is a layer of frost on the back panel of the freezer. It sounds like this is a defrost issue, but I physically don't know where to go inside the refrigerator to attempt to fix whatever is going on? Please help! Thanks,Tracy:)