My '08 has this same problem; I took it to a dealer (not the one I bought it from, since they're no longer in business
), and they kept it for a week (while they were also supposed to work on fixing my roof leak again, and change my oil w/materials I supplied). They claimed they tightened a heat shield that fixed the noise at crawl speeds, but it's still there. I was verbally told they ordered the seals to fix the leak, and would call me when they came in, but after a few weeks I went back to my paperwork to see how long it'd been, and on the official paperwork they say they were unable to find a leak, and there was no problem! Then to top it off, when I picked it up they tried to charge me something like $30 for an oil change, when I provided them synthetic oil and a filter!! They credited me for the oil change materials, but there should have also been a 1/2-quart of oil left over that I never saw (and now I'm wondering if they just dumped the full 5 quarts in there!!).
I was miffed at first, primarily because I'd a fair amount of money on a rental car (they kept my Pat for like 8 days), and basically all they did was change the oil (which I typically do myself anyway). I'm almost at 36,000 miles, which was the reason I took it in to have these things addressed before the main warrant expired, but I finally decided that A) the power train has a lifetime warranty, so if the problem becomes a costly issue I have a record of bringing it to their attention early on, and B) if the leak continues to be an issue, I can probably get it taken care of myself cheaper than I can rent a car for a week, and C) I will NEVER do business with this dealership again. During the time they had my vehicle I'm not sure they ever called me; I was always having to call them every couple of days to see what the status was, since I kept having to extend the rental car contract every couple of days.
Anyway, sorry for the rant, but just bummed that the dealer I bought my Jeep from was only a few blocks away from my office, which was one of the reasons I bought it...now I have to drive 15+ miles to another town to get any work done, which becomes a major scheduling problem.
I'm also discouraged because of the huge variety of diagnoses that are given for this problem; as common as it seems to be there ought to be a confirmed cause/repair sorted out by now. At this point I'm just going to treat the noise as "normal" since it seems to be so prevalent, and be sure to take mine in for it's 5-year checkup to keep my lifetime warranty up to date, so if it does become an issue that requires repair it'll be covered.