Trident 65 / 75 Series COMPLETE manual with schematics and component list.
Channels, Monitor, Echo return, Master strip, Group busses, power supply and master channel sub-board.
If you don't need the full manual, I have also just attached a ZIP file of the schematics which I've enlarged and enhanced into JPEG format.
These docs enabled me to re-birth and rebuild a100% operational console - hopefully can do the same for you.