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I agree - I'm 98% sure the damp, salty gear is the source of your problem . . . . and I doubt a 'paint warranty' would be honored for the inside of your van. Even if it was, their repair might be worse looking than what you have now Don

Go with a hybrid system ... I have the stock horns on my Aurora as well as a kill at 100 paces air horns. The stock horns fire right up when you hit the button, but the air horns take a second for the compressor to charge up. A slight touch of the horn for that anemic factory sound, and just hold it longer for a 130db of sonic assault. Worth noting, that's a separate compressor system, and you might not get the same delay on smaller horns. PS ... recently added air horns to my motorcycle. The Stebel #11690019 is a compact one piece unit that would probably mount right up to the stock bracket on the TCs and shouldn't stress the stock relay and wiring.

If you do go the warranty route,I would not mention your wet saltwater gear as I'm sure they would use that as an excuse to deny coverage. Wet gear inside a warm closed up van probably creates a "salty" humidity. My family owns a house less than 1/4 mi from the ocean and anything that can rust eventually does,even indoors. Your rust spots are identical to the rust we get on the edges of appliances where paint is thinest.

Jesus, how often do you use the horn, especially for respect?

This is exactly the type of rust that would fall well inside warranty terms. You could not have caused it even if you really wanted to. It's not penetrating rust but it may be a sign of catastrophic manufacturing error such as missing galvanics.

Not me. I would start looking into a Lemon Law lawyer. They took your money. You got an item which does not perform as promised.