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The cylinder didn't get warmed at all did it? All regs have a fail save, so if the pressure in the cylinder gets to high it'll degas to stop it exploding.
They could just hook it up to a pressure source such as another bottle or other pneumatic supply and see if it can maintain the low stage pressure which ought to be somewhere between 1 and 3 PSI as you set the needle valve. If the side of the needle valve has failed and is still in a failed position the outlet pressure would be higher as shown on the low stage gauge. That's the only way it could have emptied and entire bottle of gas in a few hours. For example you set the needle valve 1/4 turn which should read maybe 1/2 PSI and instead it reads 5 PSI. It might even be that when you have the needle valve closed you still get a pressure reading. This means an internal leak as opposed to an external leak. You could do this yourself but you'd have to use another full bottle and monitor the gauge.
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