They said they want to keep it one more day to verify vibration.
On another note, the driver’s seat creaks a lot. And a popping sound in upper back. They are replacing entire front seat. These seats are not easily serviceable.
Actually the seat bottom is definitely serviceable, since mine was replaced for creaking. They took the entire seat out, and replaced the seat bottom, - reusing the faux leather and components inside my existing. Didn't take them too long (maybe 45 mins or so).