Hi I am new to Mercedes having only diesel trucks and have an 04 e500 wagon. I have read some of the air ride dilemma questions here and have had a failure which is only effecting the RF. I got out and heard a loud squealing air leak from the rf and then got the warning on the dash when I got back in. Since I heard such a leak I assume the regular pump and relay system may be ok and wanted to ask what the thoughts are of more experienced owners.