I had my airs truts fixed with a repair kit last week, but I noticed my front still goes down after few days sitting outside, also in history that the dealership attached to my receipt, I noticed it says air control valves not functioning correctly, how much it cost to replace? Im actually taking my car to a shop next week so they could reset the height/calibration, so I want to know appx. total for labor and parts before I go in there.