To put your mind at ease, I have a xc90 2011 200hp - have used the smith and allen 3309 fluid toflush my gearbox twice using the gibbons method. First at about 50k and was black - then again at about 90k and had more red in it then. Now at 105k, drives very smoothly on the box so can give thumbs up to it.
Personally I'd just flush at your mileage with about 10-12l as will be gunked up - doing gibbons is best bet. Then after about 10k do it again with remainder of fluid. Don't quite believe the naysayers about issues, good fluid will be a lot better than 60% bad fluid with a dump and refill.
BTW have done flush on previous 2004 xc90 at 80k miles, sold it at 100k and guy who bought it said smoothest gearbox of those at that mileage he'd looked at.
And from what I understand the old xc90 only ever used aw1 in last year of so of production - 13/14. They carried on with 3309 longer than other vehicles.
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