First air suspension issue

[M-A8]

Thats funny, just found this info in SSP292:

but this I understand is pressure value inside the springs, can you measure pressure on each spring??? I switched through all the channels yesterday and there was no group for individual springs

''Each suspension strut features residual pressure retaining valves directly at the air connection.
This ensures that a minimum pressure of approx. 3.5 bar is maintained in the pneumatic
springs. This practically eliminates the risk of damage during storage and assembly to the
greatest possible extent.''


Another interesting thing about the accumulator pressure of 16bars not the compressor pressure:

''Accumulator
The accumulator is situated between the
floor of the boot and the rear silencer on the
left-hand side of the vehicle.
Construction:
The accumulator is made of aluminium.
It has a volume of 5.8l and a max. operating
pressure of 16 bar.
Function:
The objective in designing this system was to
reliably satisfy functional requirements
whilst keeping energy consumption to a minimum
(so that the compressor is on as little
as possible). In order to enable controlled
pressure build-up to be effected solely with
the accumulator, there must be a minimum
difference in pressure of 3 bar between the
accumulator and the pneumatic springs''

>>>>>>
Final control diagnosis
Final control diagnosis checks the function of
the compressor, the solenoid valves and the
struts/shock absorbers.
Diagnosis is executed automatically in three
steps.
1. Test of each individual strut by lowering it
20 mm below its current level for a period
of 30 seconds
2. Charge and empty the accumulator
3. Variation of electrical currents to actuate
the shock absorbers
Final control diagnosis is implemented when
the vehicle is stationary and the ignition is on.
The engine may be running. During final control
diagnosis, the yellow warning lamp in the
dash panel insert flashes.