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I would not go so far as to say you will HARM the transmission by changing the fluid, I am just saying it is not neccesary or beneficial. For some sort of peace of mind maybe. My stance is that if the transmission is going to fail, it will fail whether the fluid is changed or not. Unless you are somehow capable of "cloning" a particular transmission, there is really no way to either prove or disprove what I am saying. I personally knew of a car (E300D) which made it past 350k without the transmission ever having any work done; repairs or maintenance. The owner put this amount of miles on within a few years and always had the car serviced per MB, including oil changes whenever called for by FSS.
Of course if you take it to a garage they will recommend a service; it's how they stay in business. Even many dealers recommend doing some sort of service. MB to this day still says the 722.6 has no fluid change interval.
That said, I woud be curious to see what kind of gunk is in the pan at probably 200K, seems reasonable to me.
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