Have you checked if the auto box has a sump bolt? My 87 AW70/1 has one and it's a doddle to drain 2500ml, refill, drive, repeat five or six times or until the 20l jug has gone. Every change brings back responsiveness to the box, even though the colour cleared up by the third change.
Advice about sump filter all good too, if a little more involved.
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