The rear passenger suspension is sagging about 1 inch on a 2019 Expedition Max with 17,500 miles. Tires are properly inflated. The sagging is visually noticeable as the car leans to the passenger side. Dealer claims I need a CAM kit which is not covered under warranty (all in quote is $716.98). Dealer says this was covered under the 12 month 12,000 mile alignment warranty and is now out of warranty. Car has the continuously controlled damping (CCD) suspension. Does this sound correct? Thanks for your thoughts.