There is a genuine LM308N chip sitting snugly in a socket (pictured). You can test swapping out other op amps but I really don't see the point because the LM308 sounds amazing and the distortion knob sweeps perfectly. No other mods were done.

Actual item pictured, please inspect the photos.  

Pedal is 100% functional, it is in perfect working order.

Let me know if you have any questions!