Are you sure they put new valve stems when they changed the tires? That's a common problem, new $600 tires with old valve stems. Rubber gasket on the stems will dry out and leak. Had it happen before and just had it happen with 6 new tires when we bought this one. Made them redo it.
Another thing is the extension should only have pressure when you depress the valve stem to check it. Unless you have tire monitors then they will stay pressured up. I had to take off the extensions on my '93 when I added tire monitors since they would leak.
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