All everyone has said is probably true (network trouble). Still is he's receiving yellows and that mean's the AT&T switch, no matter what kind it is, is loosing signal. So depending on what's on the circuit, as far as monitoring equipment goes, AT&T ought to be able to see that and narrow it down. At the very least they should be able to see the LOS at their switch. I'd think by now most of the NID's would be the smart type that they can pull PM data from also. I think I'd be doing a little more talking to AT&T to see if they have access to PM data.

Retired phone dude