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I appreciate everyone's thoughts so far.

Fortunately the plumbing is either exposed or between floors and I haven't seen any sign of water--either coming from the exposed pipe or causing any...

@rmelo99

Yes, have an on demand recirculating pump, but unplugged it to eliminate it from the problem. Also, we can hear it running when it's working. I've also checked the cold water line coming...

So here's what I know:


Started noticing the the temperature of my shower water was fluctuating...generally warm but with patches of cool water.
Replaced the dip stick (the old one turned out...