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Did they come stock or did you order them after purchase? Either way should be covered, but if you installed yourself they might give you some grief if they can prove it.
My car, though it had 1800 miles on it, was nearly a year old when I bought it. A couple months after that the plastic cover over the Infiniti lettering started bubbling on my lighted kickplate, and the entire kickplate was replaced under warranty. Also I'm fairly certain it's LED and not a normal bulb, tell the dealer to fix that!