I think something really odd is going on. "Line 3" is now down and line 4 is back up to full speed and it’s SNR vs tones graph looks normal. That says to me that Janet switched modems 3 and 4 over when asked by AA and hasn’t switched them back, but why "line 3" really line 4 was then down is a mystery. The test program that I write which queries the firebrick and gets the status of all the lines says that line 4 is the correct BBEU ID now though - it has a table of expected values and checks them off to detect modems plugged into the wrong wall sockets. So I’m totally confused. I asked Janet to put the modems back to the way they should be when AA’s test session had had a while to complete. It looks like i’m seeing line 3 into modem 4 - good SNRM vs tones curve and high speed and dead modem 3 line - presumed line 4, so they haven’t been swapped over, but then how can the BBEU check now be succeeding? The program has been tested and it has detected cross connected modems successfully before.