Hi Emma,
Not going to be much help here to be honest. We have the KM020 and this is the only problem we have had with heavy machine use in 4 years - and a minor issue at that.
This place is good for spare parts
http://www.buyspares.co.uk/ If you're in the UK, you can call this number 02392 392 333 and give them your post code, they'll let you know who the local service agent is.
All the best,
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