2001 S-500 suspension will not rise
 

I have a 2001 S-500 that will not raise up, it has the air suspension I checked a three fuses they are good I hear the air pump in the front right corner running every now in then for a few seconds. It now has a fault code on the multi purpose screen, "take to workshop" I think it has a leak somewhere, if anyone has had this problem or heard of this problem I would appreciate any help Thanks