I think Ohio Joe's got it pretty right - prolly picked up something else though perhaps a nut or bolt, or even possibly one came loose from the car itself - unusual as that sounds. If it's a roadside pickup of any foreign thing, I doubt warranty would cover - perhaps under a goodwill. But certainly if it's your own piece of somethin' the warranty should ...
Hope they didn't leave something loose from the 5k check up -
Hope they didn't leave something loose from the 5k check up -