On a machine that old, I don't have the modern style of service manuals, but sections of different service manuals could assist with understanding a process of a specific repair. Is there a specific section you need, or is this a case of "I bought a used machine, but it had no manuals and I'm looking to get anything"?
If you need a whole new set of what are called "shipped manuals" (the ones that shipped with the machine) it is recommended that you contact the parts department, with your serial number, and they can assist with a replacement set.