Can I just check I'm looking at the same line as the stats reading I did in your 1st post?
Having just looked at your latest SNR/Tone compared to the one here, it almost doesnt look like the same line. As mentioned in my earlier post, the first graph seemed to show RFI/EMI centered around tone 1700.
Yet you latest graph shows D2 as pretty clean. Even the upstream looks different.
D3 now has an extended bit load (3000->4074), but some signs of RFI circa tones 3500
Sorry for the confusion. The first post is from my first line with Zen. The new line with AAISP produces a completely different SNR graph, particularly on the upstream. This could be due to a combination of both the pair I'm on and the fact the line card is running a different version (b206 on the first line, d086 on the second line). The power on the downstream for example is around 13 on the new line that's on a line card running d086, where on the first line that's on a line card running b206 I think it was around half that.
Essentially although it's the same wire running from the house to the cabinet, it's just on a different pair and a line card running a different version. The underlying problem however is still present of course.
EDIT: As Victor Meldrew from One Foot In The Grave used to say, "I don't believe it!". Astoundingly another SFI engineer has been booked by TTB to currently come tomorrow, it's a morning slot where I would prefer afternoon so am waiting for confirmation on that. I didn't ask for a third SFI engineer but apparently they aren't satisfied with the previous engineer. They requested that the D-side be investigated, but the engineer notes don't indicate any such investigation. They also requested a coop with their assurance team which didn't happen. I've asked for clarification on what D-side investigation means, as I imagine it's more than just testing from the master socket.
Despite the PQT passing and everything from the engineer's tests appearing to be fine, the line to be of good quality according to the PQT, and the engineer offering a pair swap which we agreed was a fruitless exercise, they're still booking another SFI engineer due to the errors on Yukon. I'm not complaining so long as I don't get landed with three or more SFI charges in the end, I was prepared to accept that this fault might be too difficult to identify the cause of after two SFI visits. It seems AAISP and/or TTB aren't satisfied with the results of the previous two SFI engineer visits though.
I don't know what a D-side investigation may accomplish, though the line did drop under heavy rain two or three times last Saturday, but the PQT and Hlog show nothing wrong with the actual line and to be in excellent condition. However I'll just go with what AAISP/TTB feel is best to do.
EDIT 2: Been told the engineer will be informed of the line history by the Openreach escalations team, expecting them again tomorrow afternoon. Wish me luck! I've also mentioned the pattern pointed out on here regarding my error seconds/hour and then FEC errors/min both dropping in the early hours of the morning and then returning to their usual amount again. Thanks for highlighting that.