If you bring it in like that, they shouldn't charge you to diagnose it. Just ask a mech to come out for a minute and show them the leak. They can tell by looking at that, it's a common problem.
I got mine goodwilled for half of it, so you should be able to get that, too, if you have a good relationship with your dealer. That'll only work up to 60,000 miles though, so don't wait too long. It cost me ~$200 for my half, since they have to use warranty hours for goodwill work.
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