I went to the local tire store(NTB) and we put the tire in the dunk tank. No bubbles. No bubbles from/in the stem. We looked for bubbles in the bead/rim interface-none. The pressure had not dropped overnight but I still took it in. Every other time a slow leak was a nail. Of interest is this rim was remanufactured. I will follow the pressures.
Ferdman you are right about pressures-use the guage.
Time will tell.