I have a 1 psi per day pressure loss (a bit less really) on an 90 psi pressure test for bathroom plumbing. I have soaped every joint and fitting, including the shower mixing valve, and do not detect the leak location. I have a sense that one of the temporary nipples, which are threaded into drop ear elbows, are leaking. The system is a mix of copper (in the walls) and PEX (in the crawl space). For practical purposes, is that even a leak that would result in accumulated moisture and would it be better to simply charge the system with water and see if I get a drip? Thanks in advance.