Ice maker is overflowing the tray when it fills with water after a harvest cycle. We end up with a frozen block of ice around the auger to the ice cube dispenser in the freezer door. Sound like a bad fill valve? If so, what is the easiest way to get at it? I followed the water line up the back of the unit but it doesn't look like I could get at it from the back. Can't see the valve from inside the freezer, just a large white rubber hose that comes through the back of the freezer to fill the icemaker. Any ideas? I also found a diagram on-line but it doesn'y show a fill valve at all.