Cal Audio has gone through some changes. It was acquired by Sensory Science, then Sensory Science was acquired by S3 Corp, which has changed its name to SonicBlue. In the process, it looks like the Cal Audio brand was shut down. Factory service, which at one time had been at the Blue Lake CA location was relocated to another state, and now appears to have been shut down. (Calling the number in Camadeco's post says the number has been changed to a number at SonicBlue, where the operator will refer you to 800-736-7679/menu-item-#3 for Cal Audio service which then refers you to their web site for regional service.) Service has been farmed out to regional service shops. The following link to the SonicBlue web site identifies three service facilities. Good luck.
http://www.s3.com/support/goVideo/c_service.asp
http://www.s3.com/support/goVideo/c_service.asp