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Thank you MoosaHemani for your quick answer, that is a relief. I think I will ask the client to delete all errors again and have them check when Google processed the latest sitemap, just in case.

Remus said it well, they are obvious thin content pages, almost identical, Search engines don't want to list every variation of a simular page. You need to add more unique content to each page. But when I visit, using IE 11 on Windows 8.1, I get a big warning about cookies. This can't be good for conversion. do you really need this warming?

Thanks Thomas for all the extra links. I will check them out later!