Korg SP200 keybed?

[BazC]

Apologies that this is a little off topic but there doesn't seem to be a general Korg DP forum.

I have an SP200 and I'm trying to find out what keybed it uses, it's an ungraded hammer action so it's clearly not an RH3 or NH that is currently being manufactured but what is it? I've heard rumours of Korg using keybeds from Yamaha and Fatar and that they make their own so who made mine?

Anyone know any more about this?