Sorry, we have one that works, but are on this side o' the pond,
probably not so many places to get it fixed here either , unfortunately ..
i'm starting to think i should have a backup when the time comes.
I got some broken buttons replaced on mine at Synth Service Centre in Acton, but I wouldn't recommend them, they had the thing for months and I've had previous cock ups from them.
The problem is that it's very hard to get spares in the UK.
If you know what's wrong with it, I would recommend getting the spares from eBay or www.mpcstuff.com and then getting any competent tech to do the work for you.