The model and serial number is easy to find once you know where it is:
1. Get a flashlight
2. Pencil and paper...and a second person to write things down can help.
Sit on the floor on the left side of the organ, lean back onto the pedalboard and look up above underneath the keyboards...the keyboard.
Basic model names of Digital Tone Generation Organs
Trillium Masterpiece
Trillium
Allegiant
Insignia
PDI
Global