Russian Big Muff Mod Question

[Shannon]

So I'm modding a friend's Russian Big Muff (the current production black ones) and somewhere along the line two wires have broken. The first is wired to the underside of the PCB to one of the pins on the input (I think) jack and the second is attached to the enclosure itself. I'm guessing the second wire, the one that's attached to the enclosure, goes to the big ground pad on the bottom corner of the PCB?

Where does the other wire go though? Anyone with a Big Muff care to point me in the right direction, thanks.

And just for the record, those big muff's have the worst wiring I've ever seen.