[Richard]

Great write up! It illustrates the value of understanding the system, applying logic to isolate specific sections of the system, and a methodical disciplined approach to narrowing down the suspects.

You have me thinking. The one constant in Newell ownership is chasing air leaks. Your logic in separating the three systems has me thinking about permanent installations of the isolation tool(s) in locations to separate main, from 120v, from 12v systems.

So when I win the lottery my must have list for the Newell build will specify all compression fittings and an air system manifold similar to the water manifold.