is it posible to change drum bearings on a zanussi zwf1437w machine?

the drum bearings are about shot, had a look today but on first inspection it looks as if the outer drum is plastic welded together no fixing bolts just lugs. thus making it almost imposible to remove the inner drum to gain access to replace seal and bearings. just wondered if any one has come across this. if so advise would be greatly recived.
thank's steve.