unbalanced roller?

i have been using the fluid 2 trainer from cycle ops for about a year
now, and have noticed that the roller has started to
woble more and more each time i use it. when at speeds
of 20mph or higher it is very loud. i thought this
might be because of using it on a wooden floor. i
moved it to a concrete floor, and it still made the
noise. its also vibrates vigerously when at speeds of
around 10-15 mph, but gets better as i go faster.
simular to an unbalanced wheel on a car. i have
watched the roller as it is being used before and i
can tell a slight woble in the roller itself. i even
took the bike i was using on it to a bike dealer to
have the wheel balanced and trued, and have also
changed the tire and made sure the air pressure is
where its supposed to be. so it seems it all points to
the roller on the trainer. is there any way to service
this? or will i have to have someone from cycle ops
look at it? thanks for any suggestions and help!