I think your dealer greased up the spring perch for the front suspension. Look at where the front spring contacts the spring perch on the shock housing. You can put your hand on the spring and have someone rock the car... maybe you can feel it that way. Or... try using some WD40 on the spring perch... if the noise goes away... your problem is there. Maybe have your dealer install some rubber pads under the spring where it sits inside the spring perch. That should solve it.
