Its a big job.....the machine will require a full strip down.The repair procedure is a little lengthy for posting on here.
Take a look on youtube,espares have got one on there,for bearing replacement.
The video covered isn't your model,but its a similar procedure.
It will give you a good idea of what's involved.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix washing machines.