How to renew the finish on old speaker cabinets?

[rsmt2000]

Dave or anyone have any idea if there is a way to renew or refresh the color on Sierra speaker cabinets. I have them in espresso color and have one or two minute nicks that I would like to address and renew their color.

[Mag_Neato]

Furniture touchup marker? I've used the touchup kits that came with our kitchen cabinets on some furniture!