Ask them what they would be doing to fix the problem and if they guarantee that the problem will be fixed for that price. My guess is that think it is the detent spring, but when they get in there and find out that it is not the problem, then they will charge you $2 or 3 thousand more. At that point the bike will be in bits and you will be committed to them doing it. Get the price guarantee the the problem will be fixed - not that a particular job will be done.