Another Disneyland Records Question

I got another question about Disneyland Records. Did you know that on every Disney LP that has dead wax markings on the dry groove, take for example the soundtrack to "Cinderella", the catalog number on the master reads "DQ-1207-A" and "DQ-1207-B" on wax, but it appears to be a mastering plant describes as the two initials where it says on dead wax "SS-BR". don't know what these two initials stands for. "SS" stands for "Sunset Sound", and "BR" stands for "Brian Ross", who was at the time was the recording engineer at Sunset Sound. This was according to the book "Mouse Tracks". Has anyone checked that out what "SS-BR" means?