QJS, I'm sure there are three sides to the story, but if you have a customer who purchased two, couldn't get one to work in either boat, and you tested it and had it working, why wouldn't you still just replace it with a different unit? This is exactly how I would handle this sort of situation and have many of times. I have a good working product (as far as I know) and the customer has a brand new one and is happy. It doesn't make sense to go back and forth or argue in that situation. No one wins.
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