Changing automatically transmission fluid?

I have a 97 honda civic with a 1.6L SOHC (D16Y7) and i want to know if it would be a good idea to replace the trans fluid. I bought the car with 135xxx miles and its currently at 141. The trans fluid is very dark. Nothing is wrong with the trans as far as i can tell. I want to replace it, i would be doing a drain and fill. Any thoughts on it?

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