Hi from France,
Just fixed the beater bar on my DC25 by replacing the reset switch.
Working fine now except for one small thing - instead of defaulting to "off", the beater bar comes on every time the cleaner is reclined.
Not a big problem - actually better for carpets - but means it has to be switched off each time when working on smooth floors.
I guess something is not quite right with the little white plastic component and its tiny spring behind the grey switch.
Easy to fix? Or better to put up with it because it's not worth fiddling? Those buttons are quite difficult to click back into place.