[BillA]

I am having a similar problem, but I think my leak in on the back side of the utility box where the flush line penetrates the plastic wall of the box. Most of the water is going into the black tank and out the sewage line but some is running back inside the lower section of the utility box through a seam in the box and some is running off the back side of the plywood shelf the water heater sits on and falling into the insulation below.

I located the access panel in the lower right hand corner of the pantry but did not have time to open it yet. Based on where I think the leak is will I be able to access it through the panel or will I have to remove the protective panel and insulation and come up from below the trailer? Any other suggestions?