The driver's side of my wife's X5 (64k miles) was sinking whenever the car was parked on a significant slope (side-to-side) for the last couple of months. On flat ground the air spring stayed inflated. I assume the deflection caused by the side-to-side slope simply forced the leaking section of the spring to be "opened."
-- As an aside, in hindsight the first occurrence was provoked by lifting the front-passenger side to remove the wheel and extract a rock from the brake. --
I finally replaced the driver's-side air spring with the one from Arnott this past weekend. It was a very simple job and I'm an absolute novice. So far so good.
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