In case you are interested
I took advice from the forum and decided to first check the in-line screen filter. Before I did that though, I stopped by a convenient RV dealer and purchased a new check valve assembly. ($19.58). So I ppopped off the screen filter and noticed that the internal spring of the check valve and its "keeper" had become dislodged - the keeper was in the filter itself and the spring pulled out easily. Figuring that it needed to be re-seated, i just put the spring back in (there was a similar plastic keeper seen centered at the seat of the spring). I pushed the little keeper in until its' edges held the sprring down inside the assembly - the keeper caught and held the spring down at the base of the valve opening. The screen was clear of any debris before replacement.
Reconnecting and turning on the water - I was prepared to just replace the valve again BUT - now it is working fine! So, I have a new brass check valve in case this fails again. In the meantime, I am going to avoid the temptation of turning on the drain valves while the system is pressurized - I think that is what did it!
Thank you all!
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