It is hard to tell from the photos exactly how much corrosion is present. Keep in mind that wet batteries "breath" and will create some of what you see when enclosed in compartments that don't have much air movement. I would certainly have the dealer clean the area with the proper battery acid solvent cleaner and have all the batteries tested.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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