I have a self-venting single-stage pressure-reducing regulator that takes ~2500 psig and steps it down to ~1500 psig (here is a link with the specific details of the hardware if interested: http://www.items.se/Dokument/44-1300_10061107.PDF). I experienced some odd behavior recently where the pressure transducer in the downstream process piping began a steady decline at ~50 psi/hour after remaining stable for ~3 hours. This pressure should be stable since the GN2 sitting in this line should be static (nothing is actually flowing during this time). I cannot seem to explain why this is occurring. Upstream of the regulator, pressure is being supplied to multiple other locations where it does continuously flow. Any insight as to what is occurring would be greatly appreciated.