Gaskets dry?
If it's the first outing, it's possible. Just now I put water into my system, and the kitchen sink faucets decided to leak a little water out under pressure, at least until the gaskets in the faucets got a little wet. I think it's stopped now.
I'd keep an eye on it, but if it doesn't happen anymore, I'd venture a guess that that's the culprit.
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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