Electrolux Ergorapido EER89IBM brush roller doesn't spin

Hi all,

I have an electrolux Ergorapido EER89IBM, and the brush roller doesn't spin. There was a period where it spins for about a minute before stopping, and it will spin again if I switch the vacuum off then on again. Now it won't spin at all. The vacuum itself works fine, but since the roller doesn't spin it doesn't collect dust properly.

I'm thinking of replacing the motor in the nozzle since it might be damaged, but I have no idea how to disassemble the nozzle head. Does anyone have any guide on how to replace the motor?