The clunking is probably from the drum rollers. They are rubber, and disintegrate. I replaced mine a few months ago, I bought them online. You will have to remove the drum to get to them, you find find instructions for doing that on the web and replacing the rollers at: http://applianceguru.com/forum2/6940.html
You might also replace the drive belt while you are there to save another.
Novice but regular asko repair guy, November 2009