Feel your damper for oil, and examine the suspension opposite the pull. I had a left pull some years back, and it was a front main leak which was being flung on the right disk.
Certainly any contamination may cause a pull to one side. You might also verify your front tires are equally inflated. Of course on a U.S. road with a significant crown there is usually some pull to the right when braking.
Thanks Colin, I doubt it’s worth testing but one of our damper-curious fraternity in the US might be willing to cut it apart to see what’s in there and what went wrong.