Just returned from a 1300 mile trip and noticed my steering felt heavy and I had a high frequency vibration. I had two different Master Techs ride it and they can't agree on the cause. Spent all day at dealership Saturday. Turns out I picked up a nail on the trip so they replaced the front tire; then they replaced the left front rotor (a little out of spec); and replaced the front pads (cleaned calipers as well); then the new tire wouldn't balance so they replaced the front wheel bearings.

Good news is that everything except the pads was covered under warranty, bad news is that vibration is still there. One tech is saying I need new motor mounts, the other is saying my front calipers could be dragging (or not releasing)

Any thoughts?