Here are some of your photos which you had sent me. I resized them and saved in my GbL Gallery.
The boost circuit, locking tuners, and control knobs are all upgrades done by a previous owner.
I wonder if there are any additional changes to the control circuit, like upgraded pots?
Your guitar is a Made in Korea Tribute Series S-500 built in May 2003. It has the Amber finish on Swamp Ash body.
See:
What is the new Tribute series which G&L announced in 2003?
I would say that the updates should add some additional value (no idea how much) to this guitar.
Hope this helps.