I know that a lot of us have questions about just how much Quality Assurance checking is done at the factory, and believe that the Dealer PDI is the final checkout inspection in that process. Most of us believe that the water lines have never had water in them to test for leaks, the gas lines have never had gas in them, the refrigerator has never been brought down to temp after it was installed, etc. The dealer PDI should check all of these functions, and it is very much advised that after a thourough PDI, you stay a couple of days near or at the Dealer's lot to find more stuff you might have missed, to get it on the warranty repairs list.