Have the owner drop it off, and show up during pickup to speak directly with the service guy. It would be even better if you could speak with the tech, but they probably will not let you. They should also provide you with a written report and estimate of what needs to be fixed (not covered by warranty or service plan) and for how much. They'll probably find something such as tires or minor cosmetic stuff. If you want to buy the car, use that to the lower the price.
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