I have an old Subzero 2350 that keeps going into CLEAN mode (red light). I have replaced the ice grid which works fine (warm to touch) and replaced the bin thermostat. It will work for a few days, fill with ice, then go into CLEAN mode and be very warm inside. No ryme or reason. It does seem to work a little longer when I clean it wiht the nickel free stuff. What part or two can I try to replace before having to buy a new one? Any help would be appreciated. Thanks, John