Wow... that is something Thank you for sharing... and talking of wires that disintegrated as soon as the engineer poked it with his screwdriver, heres mine in case anyone is interested.Graph 1 - with corroded terminals in the BT66Graph 2 - terminals rewired and terminal block replaced. Dip at circa tone 60 gone and U2 now smooth. Still had HR issues with the line though and upstream SNRm would drop drastically if the phone rang - note the squiggles in U1 bandGraph 3 - Fault fixed - new pair.