find out what drive you have, and I would suggest buying a new one and swapping the drive mechanics and leaving the same circuit board that came with the system.
The reason I suggest that, is that these drives have several forms of mechanical failure that conveniently happen right around the 3 year mark. So if you chase this one down, chances are that before long you will have to chase the other ones too.
Swapped one of mine for $40 and gives you piece of mind for a couple years. Post your drive model (go to llama's website for drive ID) and we can find you the cheapest on web.