What's it with those Canadian EH101?

Here is an article
http://www.canada.com/topics/news/national/story.html?id=d82c6296-270c-4b3e-94d9-7a25b719ae2d&k=60965
saying that the Canadian S&R EH101 are rusting on the inside of their tanks.

How can that be? Isn’t that thing made out of Al-Li? What kind of corrosion is that? (And that tailboom issue still unresolved).

Does any other operator (UK, Italy, Japan, Portugal) experience similar problems with this type?