FWIW, IMHO, worrying about powercord break-in is about as anal a concern as anything I have ever seen in this hobby! :-)
Breaking in power cords
Can I break in my new power cord by connecting it to a lamp and then leaving it on fulltime? Various threads indicate hundreds of hours of break in time in the audio system, and I don't want to wait months and months for the benefits. Has anyone tried this method?