I have some of my scarlaris enclosures at 70 to 80% humidity and have never had a problem the heat from the fixture should keep the area that close relatively dry
@Smittiferous. You have confirmed that it was in storage and that, I believe, is when the problem would have occurred. Could a wife, partner, your children, visiting neighbours kids, maybe nieces or nephews etc had any possible access? A spilt soft drink not mopped up would have been sufficient to do the damage. Ignoring everything else, the question I would ask you is how else could the steel (iron) on the base of the batten go so rusty without being exposed to significant moisture for a length of time? It wasn’t even exposed directly to the atmosphere...
Don’t worry about that at this stage. Was not well the last few days but am feeling better and thinking more clearly today. I’m beginning to wonder if the corrosion wasn’t secondary to real problem. Can explain later.I'll take another couple of decent close-ups when I get home from work of that socket, and post them up.