Where to get a reliable Cryo treatment service for Power cord?

From what I know and what I have been told, most materials can survive the cryo process and come out intact, with the exception of "pure rubber".  Pure rubber will disintegrate  during the process.  Synthetic rubber and most plastics are unaffected, I have seen where some cheaper vinyls have become stiff or rigid.  We run 250ft rolls of cable, boxes full of HDMI's, 100's of assorted types of plug sets in assorted metals and we've haven't had any issues.  Glad to hear NitroFreeze could help you, they're good people, very helpful.

Rick
Ice Age Audio

Certain adhesives have problems with cryogenic treatment. Otherwise, generally, speaking, the performance of all metals and plastics, even glass, is improved by cryo. They come out stronger, less brittle, harder, and more durable.

You could leave it in your freezer for a few days :))))

Geoffrey Owen of Helius Designs cryo treats the silver wire he installs in his Omega pickup arm, citing not only improved low-level resolution, but a decrease in the stiffness of the wire, a real good thing in an arm of course.

Jena Labs did a pair speaker cables for me years ago not sure if they offer the service anymore but you could contact them to see if they still offer the service.