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usually a bubble in the ptex base is either a defective base / materials / delamination or more often when a ski is waxed / ironed at too high a temp difference it expands too fast and detaches and leaves a bubble. I have seen it in old skis where water worked it's way into the wood core and the freeze thaw thing happened and the base detached. But a new ski? did they wax it ? Did they overdrill the holes? Or are the screws too long?.
If a screw went in too deep then it usually pierces thru and u should see it or catch your fingernail on it...or a plastic wax scraper shoud catch it . A bubble means the ptex stretched a bit.
Get the shop to check it. get them to use a true bar.Let them figure out what's wrong. U need support from the shop for either their mistake of a possible warranty submission. Good luck.