Earlier quoted context omitted.
Even in McDonalds if what they give you is defective they will replace it without question once you bring it to their attention. If it turned out the door locks on the car were defective you'd expect them to be replaced under warranty. If the warranty had expired the situation would, admittedly, be a bit murkier - but you could still make a case that since the locks had always been faulty they'd be the manufacturer's…
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I didn't work there long, but I don't remember anyone doing that.