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I replaced the coolant expansion tank in my 2011. It was leaking via a tiny crack in the bottom where the level sensor clips in. Reach up and see if it is wet around the electrical connecotr and level sensor. There is also a hose connection, behind the level sensor, but I think it is more common on the level switch.
It's hard to see under there, I used my iphone with it's light on in movie mode to diagnose where there was coolant residue to see where the leak originated.
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