CV's don't have internal speakers, so the question would be...is the winding noise coming from the organ? If you have a Leslie speaker, is it coming from the Leslie? If it's coming from the organ, it's a little harder to diagnose. There is a run motor and tonewheels that continuously turn inside when the organ is on. I'm only making an assumption here, but it could be the run motor. Again, I won't stake my life on that so I'd get a tech on that problem. They'll be able to identify and fix the problem.
If the winding noise is originating from the Leslie, it's most likely the motors. Have they been serviced recently? Have the slow motors been adjusted for proper tension (assuming you're using a 2 speed Leslie).
Good luck.