Disklavier

Anyone out there have a Mark IV?  My right pedal seems very
noisy to me, I can hear it thumping throughout the song (each
time it is pressed).  It also makes a noticeable noise, beyond
a thumb, almost as if a quiet clapping noise.  My dealer has
already been out and made some adjustments, but it's not really
any better.  I'm wondering if this is normal or if these pedals
are supposed to be perfectly quiet?  

Incidentally, the tech who came out complained that Yamaha gives
them no training, that they have to call Yamaha for anything but
the most basic problems.  Didn't exactly inspire confidence.  The
only adjustments he made to my pedal were to two washers on the
top and bottom of the pole itself, surely there is more that can
be done than this? 

Regards,
Jason