No idea if Mister Davis still does, but…Maybe here :

http://howardmickdavis.com

quote :
“RECONDITIONING: If needed and desired, I can cosmetically recondition (clean, touch up paint scratches, and relacquer) the box of any Electro-Harmonix guitar pedal so it looks almost like new when you get it back. Reconditioning, like custom mods, can raise the resale value of a pedal considerably. Deep scratches, bends, dents, and deep rust staining in the steel cannot be fully restored.”