Update: A team of Cox techs came today. They confirmed a problem down the line somewhere, external to my home. Another team will be coming to assess and repair it at some point in the next several days I understand. Meanwhile, the noise on Downstream 13 seems to be getting worse. The SNR is now below 30 and # or uncorrectables is greater than the number of correcteds. SNR was above 30 in original post and correcteds out-numbered uncorrecteds. Thanks for all the input!
I hope you got the ticket number for follow up. If it was a contractor, they have a habit of saying they escalated the issue when they really don't.
