I think it's been said once or twice on this list if it aint broke don't fix it. That really is a good saying. If something is broken and you can see the problem by all means have them fix it. But if your not having problems with certain things make sure they don't touch it. If it's working properly and they mess with it all they can do is break it. As far as the people that built it goes??? I am sure most of the folks that built it are gone and I am sure most of the plans for a 2008 are stored away some place in a far away land. Good repair shops are good and bad are bad. That's been my experience at any rate.