2012 800etec dripping antifreeze over night

I have a 2012 800etec with close to 4000 miles on it. This past weekend when sitting in front of the house overnight, it would lose a couple ounces of antifreeze. never when riding during the day. pretty sure it wasn't coming from overflow. anyone had this happen as it is in the shop now and haven't heard back in a couple days? Thanks.
 
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