Sorry, I don't have an answer, but like to share.
I have the same one! A friend of mine who was in the service brought it back from the Philippines in 1970. I did not know that they sold in the US. Where did you get yours from? I restored mine. Here it is.
I am about to start restoring my fathers SE-9000HG this summer. He brought it back from overseas as well. You seem to have done a wonderful job. I have some experience with hi-fi repair but have never gotten into a solid state console before. Suggestions, pictures, or tips you could offer? Do you by chance have a service manual?
If either of you know of anyone who wants one, I have one for sale in Maine. Great condition, works well. Comes with a dozen tapes, including Johnny Cash