Funny you say that, because when she's telling me this, I'm looking at my X5 and it's just sitting fine, no droop, nothing.

So I look at the inspection report, and under Observation, it has Failed Task - Inspect rear suspension components - Found rear leaking air spring - Replace left rear air spring.

Then I look at the regular work invoice and it has -
78260 - Rear air bags need to be replaced, cracks that may cause a blow out.

So they obviously didn't find a leak, they found "cracks". I'm yet to find a piece of rubber that looks brand spanking new after 6 years of use, but it looks like this is just a good ole scare tactic.

That being said, it's such a common failure that I'm pretty sure that I'll need to replace them sooner than later.