Water tank leak 2018 x17z

[Tony_Kuz]

Hoping somebody has feedback before I pull this all apart. Have a used 2018 x17z, was dewinterizing before our first trip and noticed a water leak from the top of the water tank. It only leaked when I had the hose putting water in the tank to flush it, pulled the seat to check lines inside and all dry,seems to be the connection from the fill hose going into the tank. I'm fairly handy but never pulled these apart before,is there just a clamp on the hose on a tank fitting? The hose inside is just a corrugated hose going into the floor and there is spray foam around the hole so cant see anything from the inside.
Any help would be great. Thank
And...no warranty..its used....

[Stever71]

Was it near full when leaking? It could be the overflow.

[DocBrown]

I also was thinking overflow. But it could that flex tube has a crack in it. Or the clamp is loose.