Started hearing a rather terrifying vibration from under the car, especially when revs were around 3,400, but could also be heard in park. At least a simple fix this time - an anti-vibration bushing on the exhaust had loosened to where the tech could spin it with his finger. Required tightening, that's all. Wondering if this will become a regular thing, though. Took about 4,000 miles for the thing to work loose. I do like the service staff at the dealer (Landers Fiat) - a nice and competent group of folks.