From inside the TT look to where the water heater is located in the wall, now look for a panel that may have 2-4 screws.
If you have such a panel remove it, with luck you will see the back side of the WH and the valves.
Note their relationship to the water lines.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
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