My left rear strut makes a choo choo sound when you push down on the rear of the car. Over bumps, the rear right rattles. There is nothing loose or worn otherwise, so the struts or the install is at fault.

Its under a 12/12 dealer warranty. I don't know if it's worth the hassle fixing the DRC dealer or replacing the struts with Bilsteins,and upgrading the sway bars myself..I have no point of reference, because I never felt the DRC as it should be. I'm sure the dealer would come through, but is it worth the hassle? That is the question.