Hello Again,
Below is a link to the Authorized Marantz Service Centers as currently listed by Marantz.
Find a Service Center | Marantz
You have indicated that United Radio did not want to do your repair. Have you contacted the other 3 service centers in your general area? I find it difficult to believe that an authorized manufacturer repair center would refuse to repair a manufacturer's product, as that is the whole point of being a manufacturer service repair center.
However, if you have your SA-10 serviced at another repair shop, you might be wise to furnish the shop with the Service Manual for the SA-10. The Service Manual has complete diagnosis and repair instructions for the traverse assembly of the SA-10.
Send me a personal message if you need or would like a copy of the Service Manual.
The Masimo sale has really changed the Marantz operations, especially in service, which was never known to be great in the past. Though to be fair, it tended to vary more by each repair shop than anything else.