Good dealership 4 service

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I need to take my truck in for a couple of minor service issues, and it's still under warranty. Does anyone know of or have an opinion about the dealerships in No. CA? The two that are nearest to me are Concord Hummer and Pleasanton Hummer. I haven't heard anything pro or con about either, but based on some threads I have read, there seems to be some strong opinions about certain regional dealerships. Thx. in advance.