Just an update, since I haven't solved the problem yet because I've been busy on other jobs and couldn't babysit the switch for any length of time.
I went out there last week to see if AT&T choked off the AM radio on their side but it was still there, so I grounded all unused pairs coming from the Demarc and all the unused pairs going to the station ports, I also found the AM signal on their single line ports going to the cordless sets but once again the compact is purring along fine.
So this coming week, I'm going to place the AM filters right at the Demarc on the outside of the building and if I can't close the door, I'm going to put a plastic bag over it and see what happens. Their Fax line that doesn't terminate into the KSU and is unfiltered so I'm hoping that it doesn't bleed over somehow, in hindsight I should have purchased a filter for that also but I was PO'd and feeling cheap.
