Just looked up your manual online. It says your bypass valve is usually in an exterior luggage area. Not much to go on. That valve should be right below and fairly close to what you are looking for. That valve should be on the cold water line going into the water heater. When you change the valve it redirects the water up to "T" into the hot line from the top of the tank. Right where that line goes into the tank there should be what looks like a brass fitting coming out of the tank. That will be your check valve and it will screw out of the tank with a big wrench and many muscles.