Sadly the OP still has that albatross hanging around his neck.
I suppose it’s going to take a lawyer to get this sorted out. And that’s just stupid.
If Passon/GFI or whoever else has a hand in the project can’t sort it out, they’d be better off getting outside engineering involved to clean up the mess.
Somehow McLeod did essentially the same thing, and for what I can find they had nowhere near the issues the Passon/GFI box does.
They stopped making them because they were losing money on the sale and the only way to fix that was to manufacture the overseas and they didn’t want that.
That came straight from the mouth of Paul Lee, who owns McLeod. It’s sad really. There is a market for this stuff.