It doesn't reduce the bug at all.
The chroma upsampling error on Denon 3800, and A1 are very mild one compared to other dvd player which exhibit the bug.
Nevertheless, it's still there. No matter how mild it is, it's dreadful.
Glad to hear it, though a little suprised. I had practically written off the 3800 based on comments here about the chroma bug. I didn't get the impression that it was a minor niggle. People seemed to have a major problem with it and to this day post angrily saying they are waiting a fix.