Disklavier

We have just purchased a 1992 C3 Disklavier Wagon in like new 
condition.

Our intention is to upgrade to a DSR1.

Please offer your experience with this updgrade.

Is there a recommendation for lowest price on the DSR1 and where we 
might acquire it.

Is there an opinion about the DCD1 upgrade (currently I don't see the 
value)

Is there any information on self service, (service manual, how to put 
in service mode, what the errors mean, self calibration?)

What can we expect for cost and frequency for service for the 
Disklavier (any advice is welcome).

Thanks for the help in advance, it will be deliverd to us on Tuesday 
next.

Cheers, 

Dan O'Connor