Thank you for this post. We just bought our new to us, 2016 3060 RL. We are on our first camping trip and after filling the fresh water tank, I turned the valve back to normal operation. The water pump started running off and one every couple of minutes. I then noticed water dripping from the underside of the trailer and the storage bay floor was wet next to where the water pump is located. I undid the service panel cover and found a leaking joint on the backside of the service panel. I tightened the joint and problem solved.
for the search function on the Montana forum.
D.