The generic manual from GS is the only one they publish. However, you should collect all the manuals and other sub-system manufacturer's information for the major appliances and items like the slide-outs (hydraulic and/or electric), levers, refrigerator, space heater, water heater, generator, inverter, power steps, entertainment system, etc.
I had a small file cabinet of all these items for my Tour Master. You can also find lots of information on-line by searching by the appliance manufacturer's model number. Consider it a treasure hunt, as this information will be very valuable to you in the future...
Chuck