The original brushes would have been the "laminated" type, in a white plastic holder. Most repairers fit the standard brushes in the black holders, due to problems with getting new laminate brushes to bed in properly. A naughty few do use pattern brushes, which are too soft for reasonable brush life.
However, consider that your kids are in nappies, so the machine has had at least four years of "light duties", before the deluge of laundry brought about by children!
Ideally, ask your repairer if he is using p/no 161460 brushes - the number is on the packet.
Which bit of "Unplug it" is causing the problem?
Stop eMailing me. This is a perfectly good forum - use it!