Just recently our Rebel has begun to display "Service Air Suspension" periodically. Suspension still works fine. One dealership has said to fully raise and fully lower the truck to possibly reset the computer. Did this and it actually has been working quite well. Error message has come back after 2 or 3 weeks so I will be inspecting all components. Will keep you informed. If anyone else has had this happen, please feel free to let me know what you have done.