Disklavier

Hi everyone!

I have a problem with 2 notes on my DC2 mark IV. When i use the disklavier in silent mode or as a midi controller, the velocity sent from 2 notes (low A and hi F) are way too loud for what i played. I live in Montreal, Canada and nobody from Yamaha over here seems to understand the problem. I think they just don't know nothing about disklaviers!! To me, it should be a very simple problem to fix since i already encounter the same kind of problem on the different electronic keyboards i own. Once in a while, i have to bring my synths to a tech to change a few midi sensors (or stripes of an octave or more) under the keys. So i presume that it should be the same kind of thing with the Disklavier. 

Does anyone have the same problem? Is there a way to adjust the velocity range on each note seperately? Is it a problem with the hammer sensor? The key sensor? I need help!! 

Thanks 

Gaetan Daigneault