I might have a possible fix for the "Service Air Suspension System that shows up on your EVIC every 5 seconds even though you know it works perfectly fine. What I did was to first tighten all the little air hoses leading to the air pump. When that worked for a few days then it pop up again I took all the connectors apart (4 total) cleaned them with "Electronic Cleaner" then applied "Dielectric Grease" into each on the pin holes. So far everything is working as it should with no more messages popping up.

Air Suspension System