Removed front and top panels. Valve on top right side was leaking by. Replaced valve and machine on right side stopped dripping. Left side has a very slow drip. May need to replace that valve as well. Will order part and return. 12-12-17 Right side leaking again. Found mineral pieces inside new valve. Opened both tanks, cleaned off water probes. Vacuumed out debris in bottom of both tanks. Cleaned rt dump valve, replaced left side valve. Filled and tested. Heating no dripping.