Disklavier

I have a Japanese MX100.  When I turn on the piano, the words "Yamaha 
Disklavier" show up on the display, and all the song titles show up 
in English.  But, all of the other displays are in Japanese.

Does this mean that the Flash Memory chip has already been replaced?  
And, if not, how can I procure an English Flash Memory Chip, and can 
I replace it myself.

Thanks