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I know this is an old post but I'm wondering if you ever got to the bottom of this. I have a 230s with some broken keys as well, already took it apart and have the bad 'rack' of keys out. I've been searching desperately for a replacement. Currently it looks like my best bet is to look for another broken one (with good keys) or that the MT-520 might have the same keys. Can any one confirm any of this or point me in the right direction? Thanks, Tony