I have a Weber Summit 670 grill. When it is cooled down, the snap jet ignition will not light all of the burners. A couple are fine. If I light it manually (it lights very quickly) and it burns for a few minutes, the snap jet ignition will start working for that burner. I understand if I have an issue with one of the snap jet ignitor, I have to replace the entire manifold. I want to take it apart and clean it thoroughly and check the electrodes for cleanliness and proper alignment. When I start this process, I would like to have a few electrodes if they are bad. Unfortunatel, I do not know the part number or where to buy them. Can someone help with the problem and where to get the parts if needed.