Disklavier

Dear All,

I have just received my disklavier although have been an avid 
follower of this group for some time.  I ended up importing my piano 
from Japan as it was not possible to buy an equivalent piano new in 
Australia.  The piano I've gone for is the disklavier version of the 
U5 upright - whereas only you can only by a disklavier in the U1 
version here (DU1A).

Whilst I'm absolutely thrilled with the piano (it's around 2 years 
old but is completely flawless in all respects), I'm finding it 
difficult to track down specifics of the control unit.

My expectation would be that it would have been a DKC500<something> 
by using Carol's chart, but it's called a "PPC500RH".  The control 
unit allows playback and recording of 2HD disks (no CD unit) - but 
I'm unsure of how to determine ROM versions or even if there are 
upgrades available for it.

Any info would be great.

Thanks!

Greg.