Air bag vs strut leaking

[Foxyb]

Is there an easy way too tell?
Came outside this morning to find my 2003 x5 3.0 front right side slammed, started her up and she filled most of the way back up. The bag was completely soft at first. I've read a ton of the self lev suspension threads but just didn't have the time to mess with before I had to go to work. Any suggestions on ordering the arnott bags or should I get the whole assembly?
Called an Indy mech and a BMW service center and both quoted $1300 for the job. I'm pretty sure I'm capable of doing it after some research, and weighing the savings I could do all 4 for the price the dealer was asking.
I know what I'm asking Santa for
Xmas
Thanks in advance
B

[Ricky Bobby]

I'm dealing with mine right now as well, seeing you have airbags in the front i believe you are also in the same club as me with having the joyous 4-corner air suspension!

I would say take a bottle of soapy water and spray the struts down while the compressor is pumping them up, just to see if you can see bubbles which would indicate a leak. my car is in the shop now, probably going to get a call tomorrow and they will tell me both fronts are leaking.

both my front sides would slam down overnight, the right side more than the left, and yes i say get the whole rebuilt assembly from arnott if you are going to replace, its only 50 bucks more! there are DIY's on their website and if you are mechanically inclined it would be worth it, but for 1300 and a guarantee on the work performed i would say thats not bad at all!

[BabyCAP]

Windex will work as well.

[TiAgX5]

Have read a few DIYs on this repair and looked it over in the Bentley, does not look like a hard job to replace them.