Gas Pressure Dropped from 20 PSI to almost 15 PSI in 30 hours

[Carlos Tchinda]

I has a license gas professional test my gas pressure. After going from 20 PSI to zero in couple of hours, we changed the fittings. The gas pressure was pumped to 20 PSI then It went from 20 PSI to almost 15 PSI in about 30 hrs. Is that a clear indication of a gas leak? House just uses gas for heating.