When I bought mine (2009, 30k miles, MCS) I need to return a couple of weeks later for some follow up. Nothing major, thought. While it was there, they had it overnight and called me the next morning and said 'hey, it's a little noisy. We're gonna take a look at the tensioner, so just keep the loaner an extra day, ok?' I said 'no problem' and didn't worry about it. When I picked it up, they had done the tensioner replacement, timing chain and a few other misc. parts in there. Turns out the old tensioner had broken and little bits were banging around inside the cover.
I was glad the mechanic had good ears when he started it up!
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