yes, replacing the blown strut makes sense to me. That sounds like a good place to start with this venture.

I read in PDF document titled "X5-Self-Level___Air_Suspension-EHC.pdf" posted in a different thread that working on this air suspension system is a complicated deal - meaning: the system has to be depressurized and pressurized properly (6x) with diagnostic equipment, etc

I think I should be able to replace the Air Strut by myself, but how about these pressurizing steps etc.?

Is it really necessary to follow these steps?

I also read that my LED's on the level switch might be out, because that vehicle is in "BELT MODE"