OK, some clarification.
1 I bench tested the system before installing in the fridge, taps and all, with EMTPY kegs. Powered up the CO2 then shut off the bottle with the valve. System held pressure for 49+ hours.
2 I then installed the system in the frige, with kegs full of water/sanitizer. Pressurized the whole thing, ran though my lines, and then closed the valve on the bottle. Pressure dropped to zero in a few hours. So either I have a leak, or the CO2 is getting absorbed. Since the bottles are full there is very little volume of CO2 in the head, and it can quickly and easily be absorbed, which is what I assume is happening. (Fizzy sanitizer)
3 I Disconnected and tested (as above) the two pressure lines again, no loss, and since there is no liquid dripping on the OUT section of the system, it HAS to follow that the pressure is dis appearing IN the keg.....