I had trouble with the water dispenser that stopped working about 2 months ago. Ice dispenser was still working and in reading it looked like the water line had frozen. Did not have time to fix the problem so I left it alone. Now the water is working again but is full of black, mold looking floaters. I changed the water filter but it did not fix the problem and now the water valve (back, lower right side) is making a gurgling noise, water seems to have a lot of bubbles. Any ideas?