We have a new(bought in April), 2014 Winnebago Sightseer 35G. I've begun getting a water drip from under the coach when hooked to city water. I use a regulator. Depending on how level the coach is, ...
Same problem if you switch to water pump? If you have leak in water system when on water pump the water pump will occasionally cycle as the water pressure drops. If no problem when using water pump then I would focus on the shore water inlet - on my rig you can remove some screws and remove the device and check the related hoses.