Thor had a recall on wiper installations for 2014-2016 various coaches, but I also received the recall notice and mine is a 2013......so they must have expanded the recall perhaps? I have been lucky and not had any issues (so far) with our wipers and they passed "official" inspection, but I have no idea what they were looking for specifically (common sense tight and operational?). You might want to contact Thor just in case your 2017 coach is now included.
https://www.rvtravel.com/thor-recall...his%20campaign.
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