Sounds likely to be the motor brushes. Ask your local domestic appliance spares distributor as they will confirm whether it has them & will be able to supply new ones. Normally quite easy to change but clean the commutator (the part that the brushes touch on the armature) with switch cleaner (or similar) & allow to dry before fitting the new brushes.
Paul Jones (Medical Electronics Engineer - Ex TV/Video/Audio))
September 2009