leak in water line between shower and sink

[scottpax]

I have a 2005, 27ft. trailer. We have really enjoyed it. This past week we were camping in the mountains without hookups. We left our water pump on through the night for bathroom water. We noticed that the pump would come on to boost the pressure, about every half hour. Didn't think much of it until the next day when it got worse and was coming on every 5 minutes or so. Then we looked around and found water leaking under the trailer to the side of the gray water tank. It was streaming pretty good. I'm pretty sure it is a leak in one of the water lines. What would you recommend doing, going in through the insulation under the trailer or going in under the sink? It seems to be between the sink cabinet and the shower, where the water lines come out to go to the sink. If through the underside, how do I repair the opening after the repairs are made? Please, any suggestions.

Thanks Scott