The trani on the 300E is starting to slip so I checked the fluid thinking it might be low and it's overfilled

How do I drain the excess fluid? Through the dipstick housing or from below?

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76 MG Midget
78 Datsun 280Z
86 Peugeot 505
01 Subaru Outback

“Owning a car is like owning a dog. Every now and then, it craps on the carpet — but it’s still your dog.” - Jeremy Clarkson