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I marked a book RWAP over two weeks ago, and pmed the sender to explain (it was water damage). I never got a response. So, I clicked the "sender has not resolved the problem" button last night.
It apparently sends an e-mail from PBS urging the sender to reply, because I got a reply in two hours, and she refunded my credit. I have no idea what the exact wording is, and I never want to know from personal experience, but it seemed to work! (And yes, I then marked the issues as resolved)