FX FX Impact leak question

I know this subject has been beat to death but I wanted to see if I’m thinking right on chasing a very slow leak. I have a Huma reg in my M2. It’s well known that the reg requires a different degassing procedure than the FX reg. With the Huma holding plenum pressure when the bottle is removed, if the plenum pressure does not drop with the bottle removed, for several days, in my case 135 bar, I’m assuming the leak must be between the bottle and the high pressure side of the reg. Seems obvious but wanted another opinion. Thanks
 
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