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They are bull*hitting you. Did they even look under the truck? The vents would have to be connected together with NO outlet for what they said to be correct.

The vent line on the transmission is plugged. Dirt dobbers do this all the time. Transmissions will build internal pressure all on their own with no pressure input and puke out of the dipstick if the vent is plugged. No two ways about it, that is your problem.