Log of gas system pressure for the FGT.

The red trace is gas bottle 1.  The blue trace is bottle 2.  Green is the low-pressure output.

Bottle 2 is active during this time period.  Bottle 1 was open but valved off.  As you can see, there is slow loss of pressure in Bottle 1 indicating a leak somewhere in the regulator.  The gas was shutoff briefly on the morning of the 30th and the pressure dropped quickly.  Attempts were made to patch up those leaks later in the day.