So, it could be condensation, it was on the cold water line. Tape a piece of tissue around each joint and see if they get damp? I tightened one joint. (I've considered this might have been potential weak point)
Everything wiggled and jiggled and was tight, no leaks. It's always possible to *strike* a pipe when working in my workshop, cutting a piece of wood and see it knock something off the workbench, for example. So, I don't know for certain what happened.. but then it blew
#TheFlood /more