Very helpful procedure. All 7 screws on my maker were Philips heads so thankfully did not need that special tool. As I did not have a spare valve, I ran water through mine and confirmed the operation of the valve by blowing on each side. The valve seems clear and working as it should but after reassembly sadly it made no difference. I think in my case there must be something wrong with the heater circuitry and will have to dig a bit deeper to determine what failed and if it is worth (or even possible) to replace the defective part.