So I have an old DOD envelope filter that a friend borrowed and used(abused) and returned smelling like an electrical fire. it turns out he didn't take the power source and used whatever he could find. 

What if anything can be done now(for the pedal, not the person!) Can I replace parts or is this a total wash now?

What if anything can be done now(for the pedal, not the person!) Can I replace parts or is this a total wash now?