Every time we get back from a trip I check all the fluids, oil , etc. in my coach. I always have to add boiler fluid (about a quart or less), to the aqua hot. I have looked at as many places as possible, all the heat exchangers, hoses in the compartment near the unit and such. There is no sign of leakage such as stains on the plywood subfloor, are on anything.
Does anyone know how to maybe put a pressure test with low volume and low psi air test on each of the hoses going to the exchangers? I cannot see any of the hoses after they go through the floor nor from underneath in the bays.