Hi guys
The location of the only 2 filters i know of for the Air Suspention ( Doesnt mean there isnt more, as a more knowledgable member may be able to help you with )
As you open the bonnet,In the back Right Hand Corner is a "Shoe Box" sized Black plastic box with "EAS" embossed onit..
The front end of the box has 2 clips that unclip and the lid lifts off,in there is the Air Compressor (Pump)... (Long Black Cylinder)
On the front end is a Black plastic screw on 3" round by 2" long filter,,This is the input filter....
On the same "EAS" Black plastic box....On the back right hand side (Outside of the box) Is a 1" round x 3" long (white) screw in filter..This is the Output filter......
Hope this is some help
LTel