I saw this here: http://www.wig-wag-trains.com/Newspages/NewsPage.htm Is there a known list of serial numbers? Other than a broken strobe light what else might be wrong? I have two undecs and at the moment no track set to test them. I could set up some track if I should be looking for other issues. As always, I am very pleased that my main vendor and Kato are on top of things.