Did you see this article in the January Ensign?
"Much praise is given to the organists who perform on the world-class Tabernacle organ on Temple Square, as well as to the organ itself. The organists have earned the attention. Credit for the organ’s performance, however, goes not to the organist alone or even to the instrument itself but to two men whose behind-the-scenes efforts have allowed the organ to fulfill its musical potential: the organ technicians."
It goes on to share many details of their responsibilities, and is a very interesting read. You can also find it here, with an accompanying video from inside the case and a photo gallery with wonderful captions.
I highly recommend watching the video and scrolling through the photo gallery. It's a wonderful tour of the Tabernacle Organ.