Resurrection of old thread as it was quite helpful with ONE CAVEAT. Be sure to pay attention to the two small screws under the dust bin!
I was getting the "stuck brush" error, tried both the original brush and the pet / allergy version and after cleaning the end caps / bushings, it would run for a few minutes and then fail. I remembered this thread, re-read it, saw the horrendous stuff wrapped around the drive wheel for the brush, tried in vain to remove with tweezers and #11 blade, "remembered" that I used to do this kind of work for a living about 20 years ago, found the youtube video of dis-assembly and followed (http://www.robotshop.com/blog/neato-xv- ... vacuum-978
) with no trouble getting to the motor and was able to remove a large amount of hair that had gummed up the motor.
On dis-assembly, you'll notice that the two screws under the dust bin (and the 1 screw holding the edge of the bumper over the corner sensor) are different lengths than the vast majority of the rest of the screws. Keep this in mind! I don't know what will happen if you put a wrong screw in the sensor but if you use the too-large general screws beneath the dust bin, you pierce the plastic and end up with 2 holes in the housing that the brush spins in. This was easily filed down and no lasting problems, but this was the only trouble in following the video and we're back up and running! Took about 1/2 an hour total.
If you decide to do this, its not hard, just follow the video and be extra careful in removing the ribbon cable attaching the LCD to the cover as its probably the most easily damaged part.
Thanks to all who post here as I really didn't want to send Nu-Nu back for repair, we've had it for over a year now and its keeping our floors (2 long haired women, 3 indoor cats, and me) clean!