My mechanic friend came over today and replaced the air struts. We used Arnott remanufactured struts that I ordered from the Arnott website. So far the front passenger side is holding. I will let you know how it looks in the morning.

Summary of Symptoms prior to repair:
Front passenger side would lose air and the body would lower to just above the tire after sitting for a night. I did not have the suspesion inactive or any other error messages. When unlocking the vehicle (prior to starting) in the morning after the front passenger side lost air and lowered, the air strut would fill with air and raise to the normal height. I tried to locate the leak on the strut with soapy water, but was unable to find it.

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2005 e53 X5 4.8is (2/05 build date) Titanium Silver exterior/Schwarz (black) interior