Thanks for the reply if i can edit the OP i will remove the code headers (I go into auto mode when posting on forums),
You mention low insulation fault, can this also be intermittent as this error has only showed once and the ISP has done loads of KBD's (As the fault was already raised with them for a while now).
I had a OR visit not long ago engineer ended up moving the master socket to make things easier, however nothing showed on the tests, OR visit was related to the Drop in SNR on incoming calls which happened when ISP's CPE was installed and even in the test socket.
Its a strange issue but i didn't understand what the error ment so thanks for that.
Also i even have a new Retain code i don't know about, Last Retrain Reason: 100000 normally its either 1 or 8000 never had a 100000.