I would definately untap it and listen for a hissing...at 38 psi if there is a leak from the keg you should hear it pretty darn quick.
When you first tapped it did you hear the whoosh of gas pressurizing the keg?
That's what told me my last keg of Molsons was bad.
Where did you get your beer gas? (I am in Phoenix too) Canyon State Carbonics has done good with me so far.
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