I was really confused till you retrieved it.
I was apprehensive about disconnecting the air supply line while the bag was still under pressure. I was wrong to be, though.
After removing it, I deflated using the diagnostics.
With the tire removed and the bottom bolt of the bag removed, I was able to hear the o/s bag hiss as I deflated it with the jack. To activate it, you must continuously press the F3 key.
The PC was in the driver's seat, so I couldn't hear anything from the n/s. However, it's likely that they were too far away.
After taking the electrical plug out and removing the bolt at the wheel hub of the rear arm, which allowed it to be pulled lower, the bag could be manoeuvred to come out by lifting it off the arm and guiding it to the back.
It may be helpful to loosen the bolt at the base of the damper and pull it out to create an additional inch or two of clearance. Although it is not necessary.
The new Arnott A-2726 (both units are the same) is easy to install in my instance.
There are diagnostic functions that can inflate, but it is not immediately clear if this is having any effect. So I put it on wheels and went for a drive. Until the level sensors were filled to the exact mark, proceed slowly.
I will make sure it no longer leaks by monitoring it overnight.
There is no functionality in iCarsoft V2 for this.
A more suitable setup was at my disposal.