I'm sure its giving up the ghost! 20yrs is a long time. I used to be able to pick up two 50kg bags of cement one under each arm 20yrs on I struggle with a 25kg one [retired 67yr old].
Try www.electrolux.com 'contact us' at top right of home page and see what they've got to say. Whatever the repairs will have to be done by qualified fitters as caravans/motor homes come under same catagory as house elecs or gas appliances. And remember any insurance is void if you do the work yourself.
Nobby
May 2008