Check the adverts in the back of mags like Sound On Sound & Future Music for authorised Akai service centres. I notice you say you need it cleaned rather than anything technical is wrong. What bits need cleaning because it is probably something you can do yourself?
It is actually something technical, when recording in samples i really need to mess around with the jacks to get any sound, especially from turntables, this seems to only have happened recently, everything else is fine, any ideas?