Fresh Water Leak

[SCBillandJane]

We just returned from a 9 week trip to Alaska. The fresh water leak started just before we were to cross into Canada. I posted and received suggestions that it might be from the outside shower. I plugged the supply lines to the shower, and that seemed to solve the problem. After crossing into Canada, the leak reappeared. The leak is only present when hooked up to city water or when we turn on the pump to use water from the holding tank. The water leaks out from around the top of the gray water tank area. I know that it is fresh water, but I am sure it looks differently to other campers. There is no water leak inside that we can find. I didn't want to let someone unfamiliar with TrailManors try to fix the leak. Now that I am home I can access the forum again, and I am hoping for advice. I live about 3 hours from the TM factory. The only ways I can see to access the leak would be to lift the tub, lower the gray tank, or possibly gain access through the rear outside cargo storage area. After reading of the difficulties of changing out the gray water tank, I wonder if the factory does this type of repair. If so, would this be the best way to handle the situation. Advice?