I wonder if you can disconnect the feed and return lines from the cooler in the bumper. Just put the feed line into a drain pan and put the return line in a big container of DCT fluid. The DCT pump should dump the old fluid out as it goes to the cooler and then pump in new fluid from the return line. Then you'd probably need to add some more afterwards to account for the volume in the cooler.
That would be really easy.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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