I have a 2013/14 32RCTS. Last summer the hot water check valve on the rear of the heater cracked. It was plastic. With some assistance from my camping neighbors we managed to pull the heater and replace with a brass check valve. Purchased an extra just for good measure. Can you see the cold water in/hot water out fittings on the back of the heater?
2013 Ford F-350 SD Diesel, 4X4, Crew Cab, Lariat
Sabre 2014 32RCTS, Pullrite Superglide 2900 18K