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OP, you should unscrew the cap and take a look under there. Does it look like the leak was coming from the cap? There is a channel from the cap that allows the fluid to leak along the seam and looks like a failed tank. I had this on my car after they overfilled after a leak test. ISTA tells the tech to overfill after doing the coolant, which depending on temperature changes can cause it to blow off under the cap. Since they just put a new tank on, I recommend you clean everything up, make sure the fluid is not above the max line, and keep an eye on it. Most likely it leaked from the cap and not the tank.
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