Michael,
sounds like the fresh water line to the Aqua Hot is leaking. On my 02’ the line into the boiler was leaking at the fitting. I had to remove the FlairIt fitting and water line and replace both. Very tight to work on, but doable. First thing to do is locate leak, then repair. The FlairIt fittings are available at the big box stores and some smaller hardware stores, Home Depot, Lowe’s, and on the internet. I believe the water line is pex. Hope this helps.