Voicing problem?

[ATodd@UH.EDU]

   I received a post from someone from another list about a problem he has
been having with his piano. He isn't really expecting me to answer it because
he has a technician coming, but I don't completely understand what the
problem might be (unless it's voicing) and was wondering if any of you had
had the same experience with this model piano, or any others? Here is the
post:

****************
   I own a Yamaha C3, purchased new. From the outset it has manifested a
buzz or nasal plusing tone on the sustain portion of several notes in the
first octave above middle C. Interestingly, the phenomenon is sometimes
more conspicuous "after" it is tuned. Our technician (who seems very
professional) rebuilds Steinways and M & H's, tunes for concerts at the
university, is the designated Steinway technician at the dealers, etc.,
has done some very minor hammer voicing as well as tapping the strings at
the hitch pins in an effort to rectify this.
*****************

   I advised him to specifically tell his technician that, on his upcoming
December tuning, he would like him to try and correct this problem. This
would allow for scheduling, etc. to be anticipated.
   Do any of you have any specific ideas about this particular problem?
I would appreciate any ideas.

Thanks,
Avery Todd
atodd@uh.edu