[sangelo911]

Don't know the 42 layout so not sure how much help I can provide. My batteries are center line above the keel bilges. The only fresh water source that could leak there would have to come from one of the water lines/fittings on the bulkhead, leaking down and running along the platform that he batteries sit on. You should be able to trace all the pressure lines as they are blue for cold and red for hot. Ice makers tend to leak but that should be obvious on the ceiling of the ER.

There's usually a shutoff on the hot water heater. You may want to close the valve and isolate part of the system so you know if you are chasing one side or the other.

I've herd of people putting dye in the dock side water using a water filter cartridge. That always seemed a little extreme to me but I guess as long as it is not permanent and you use food safe dyes and you flush like crazy afterwards may help.

Spent some more time in the engine compartment and finally heard a slight gurgle like noise when I pressurized the water system.  Cold water 90 degree elbow that is in the farthest corner wedged between the AC unit and the port side hull.  Not going to be easy to get to but I can see it actually coming out.  More than half the battle done.  I will claim a small victory for now and until I 100% remedy the issue.  Thanks.