The "Service Air Suspension" light came on for me while we were at Squaw Valley, Lake Tahoe during a ski trip a year ago. It came on at 7000 elevation in very cold snowy weather and at cold starts, but went away at restart, either immediately or with warmer engine. There was nothing wrong with air susp., I think it was a sensor having trouble with the high elevation of cold weather. I did not pay any attention to it, at the next regular service visit I had the air suspension TSB Klaus provided and asked the Hummer service people to look into it. Don't know if they actually did anything, but I have not seen that warning again since that ski trip.
I think that air susp. TSB has something to do with high elevation, required reset or readjustment or replace a chip.
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