I just bought this Motor Home and found that i do not have hot water. The tank has hot water but when i run hot water at the faucet I just get warm water. The hot must be mixing with cold water at the check valve. This coach only has one bypass valve and i suspect debris in the check valve. The bypass valve is good. But where is the check valve? I think its under the hot water tank because the hot line coming off the back of the tank with a flex hose and goes under the tank where it switches to PEX and feeds the whole coach.