99 Deville Concours. Taking a nice city stroll today and decided to park and all of a sudden I went to pull in the parking spot and: SERV STABIILITY SYS pops up. I clear the code and instantly it pops back up. So I clear the code agian and it stays off for a while but eventually it will come back. My main question is how involved is this to fix, and where is it? Thanks in advance!!