Suspension Question

[Williebeemin]

Took my 2006 4.8is in for a "self leveling suspension inactive" code that popped up the other day on the dash. I know I know "use the search button" I have and cannot seem to find an answer. My passenger front bag seems to leak sometimes and settles in the furthest position down and I will pump it back up and it will do it again. Well I took it to BMW a week ago and the whole time it was there it never settled it just stayed in the normal position. So this morning when I pick it up it did it to me again. I turned around took it back to them and left it and just got a phone call saying it was the bag that was leaking. Correct me if im wrong but if the bag was leaking, wouldn't it constantly leak and not just sometimes. My dealer has a bunch of pricks that work there and because I bought it from a different dealership they never want to help me and I feel that they are not looking over everything. My X5 is still under warranty and they are quoting me $2500 to fix it.... Any help would be greatly appreciated. Thanks in advance

Will