Well, I don't know whats up with your A3000 but, If you want to ask someone from Yamaha, the enjoy the www.motifator.com
Forum, there is always a guy from Yamaha US around... If you would live in germany i have given you some adresses where you can repair your A3000, but you are still living in the US! Argh!
If you have not enough money to repair it then send it to me in germany, I would buy that sampler!