You're correct, and it depends on how early you notice the drip. I've had my vent overflow a few drips in off-camber situations. I noticed it soon after it happened and the fluid was definitely red.Checking the ATF is a good idea regardless, but fluid dripping out of a vent tube has most likely accumulated over time and has been "outside the system" evaporating any volatile components, and accumulating dust and grime and anything else floating around the engine compartment. I would not expect it to necessarily be representative of what is inside the transmission itself or what you could see if we had dipsticks.
I would be more concerned about how much is dripping, because that vent is really meant for air pressure relief, not fluid.
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