Water shutoff for fridge
I have a 2013 GT 378. Hopefully the shutoff valve for yours is in the samr location. In the bathroom there is a "utilities tunnel", floor level, right side. It goes into the little storage cupboard on the front wall of the bathroom. Inside the cupboard, you will find an access hole in that utility tunnel. Reach in with your hand to find the valve. When I had a leak there, had to use a small saw to enlarge the access port to facilitate working on the valve.
Hope this helps!