Greetings
‘As stated above, Spectral will not publish a wiring diagram. The owners manual only shows you Block diagrams. If you decide to work on it yourself, Spectral will probably not service it.
It would be best to contact an audio dealer who sells Spectral gear. They will contact Spectral for you and arrange shipping your unit back to Spectral.
It has been my experience that some companies do not want to deal with the general public. This has happened to me on more than one occasion.
I have Spectral gear in my main system.
Respectfully
Joe Nies