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FYI - I had the same thing this summer. I complained about coolant loss numerous times when I was under warranty, and was told they pressure tested, no leaks, and topped up. Low and behold now that warranty is expired I had a leak at the bottom of the coolant reservoir where the level sensor was connected. My theory is they only leak when cold as the plastic thermally expands and seals shut (hence passing pressure test at dealership).
I replaced the tank myself....
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