Disklavier

Hello everyone,

I am new to this group and am really enjoying it so far. I am posting
this message in the hopes that someone might have some information to
share... I just recently acquired my first piano, an MX101R Yamaha
Disklavier. It was made in 1991 for the Japanese market and it
previously belonged to a family who brought it with them when they
moved to Canada. It is in very good condition and does not appear to
have suffered any dryness related problems, but there is an issue
concerning access to the test and maintenance modes of this piano. 

A technician came by my house yesterday and he could not access the
maintenance and test modes. He used the regular trick of holding two
particular buttons when turning it on, and it didn't access the
maintenance modes. He was really baffled by this so he called Yamaha
Canada, but they weren't able to offer him any  information -- since
they only deal in Disklaviers made for the North American market. 

I tried using the instructions I found online to access the modes
myself, and I had no luck either. Does anybody here know how to
access these modes in this particular model of Japanese market
Disklavier? I would really like to have the piano recalibrated when
it gets serviced next (soon) but I don't see how this can happen
without getting into the test/maintenance modes... 

Of interest might be the fact that the menu is in fact in Japanese
for all the regular use (recording and playback) but in English for
the midi setup mode. It also has the peculiar trait of being
completely unresponsive unless it has a disk in the drive and is
accessing it.

Thanks to anyone reading this message who may or may not be able to
offer some helpful information... I am looking forward to sorting
this out, since I am really in love with this instrument and would
really like to enjoy the best it has to offer.

Best regards,

Adri.