Air Leakage

The compressed air tank hooked up to our GC8890 is leaking air at a very high rate, about 250psi in a couple days, and I'm unable to locate any leak at any of the connection points or in the line carrying the gas to the machine. I'm wondering if there's something inside the GC that could be leaking air? Both inlets pass the leak test. The other gases seem perfectly fine to me.

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