Good morning

I ask if there is a procedure for adjusting the rear suspension height of Citroen C4 Picasso chassis VF7UARHE89J272342 engine 2.0 of 2009

The two air springs were changed because they were leaking; once they were replaced, the car lifts correctly, but after two to three hours of standing, we find the car down completely.

Checked for leaks from pipes or plugs, but nothing.

Unless there is an internal leak from the compressor...

Thanks in advance

A.