Once I narrow down the area I will need to remove plaster because I cant see how I would get a moisture meter in there. I do have one. What I do know is the wand for the inspection camera is 39" long, minus a couple of Inches at the camera connection and I know the direction I sent it. Thanks for the tip about insulated wire. That last pic!!?? I am not at all sure, I want to look more closely around there because I do believe it's part of the old iron boiler pipes AND it might be a connection to that that is putting out water. (I tried 3 HVAC companies before I took on the job as a DIY thing. One failed to bring the camera he promised, though I had ripped a good piece of wall to give him access. One guy insisted it was not water dripping but the sound of pipes expanding. (Like I can not tell the difference between a dripping noise and a pipe rattle.) Guy #3 was the one that had me run a useless test by turning off the water supply and see if the pressure drops. He suggest 24 hours would be long enough! At the very least, after I isolate the issue, I'll be able to say "Here is the evidence of water running across the ceiling, here is where the problem APPEARS to be. Now, what needs to be done here?"
The stack is in the opposite side of the house, I had it replaced years ago and built the walls to enclose it, myself.
