Unfortunately, I’m not at liberty to share service manuals and data provided to me by manufacturers, but quite a bit is available cheaply or for free.
Manufacturers and distributors provide service data in confidence, to technicians they trust and I work in that same way, so I respect that. It’s not a good thing for the average owner to start fiddling inside his or her amplifier anyway. One slip or wrong turn can literally incinerate your amplifier. Take it to an expert instead.