I have an LS12-EVO3 Ariston Dishwasher that stops mid cycle and red lights flash on control panel. It will not go past a certain point in the cycle and will not restart without turning it off at the wall/main. what do you think i need to replace to fix it? Any guess as to how much the repair should cost. Is it an easy diy repair or should i call a tech to come and do it. The machine is approx 6 years old.