Our 37 RL is older and not equiped with a residential style refer, but we did have a problem with a leak in the water line feeding the ice maker. The valve feeding the ice maker is located in the access panel, 1/4" poly tuping with a brass needle valve. The valve is connected to a 1/2" water line that runs under the refer and into the storage compartment where the water filter and water pump are located. Check that area to see if you can locate a valve.
We found our leak, turned out to be in the 1/2" line under the refer and behind the electrical pannel. The line had a weak spot due to rubbing aginst framing. Cut and capped the line in the storage area, used the 1/2 line to fish 1/4" tubing to the access panel reconnected to a new valve assemby.
Good luck, enjoy your rig.
Dave & Sue Mason
2005 Cardinal 37RL
2013 F-350 Lariat Trim, 6.7L B20, SRW, SB Crew Cab, FX4