Tough call here for me, but this is how I see it.
I personally have a love/hate relationship with the ex-MOD guys and gals. Yes, they may have been at the top of their tree in their own arena, and a few that have shadowed me have got qualifications coming out of their ar5e, but they haven't got the slightest clue when it comes to civvy street faulting techniques. My caveat, as always, is the extremely poor training and buddying time these folk have to experience, doesn't make for a great 'Customer Experience'. As in all walks of life, you also get the, 'You can't tell me anything' individuals, but that's life in general.
With that off my chest, these noobies (like seasoned engineers) are also under the dreaded fear of being tin-tacked if they don't meet certain standards week in - week out. They are also told (just like us), to carry out a set procedure of tests, and if they pass, then basically walk away ...... job done.
I'm not going into the rights and wrongs of this again, been there ...... done that !!
Speaking from experience, suggesting that REIN is the underlying fault is quite often a cop-out for some engineers. I'd say a high 70-80% of REIN cases I'm asked to attend, prove to be otherwise. Again, do not take my words to be gospel in respect to your fault, I'm talking in general terms, not specific, as I've never attended your fault, Kitz.
Lets say the circuit
IS fault free on the pair of wires (MPF), which TBH it doesn't sound like from your description ??, and it
IS in fact RFI/REIN causing the heartache ............. then Mr Marine Engineer should have rung our 'Diagnostic Centre of Excellence (DCoE) and chosen the REIN team option, and requested a REIN task be built.
If this hasn't happened, then nothing more will be done to rectify your perceived fault, until another fault case is built.
At the very least, a new D-side pair change should be carried out, as there could be a miniscule 'HR' on your existing D-side, that the PQT/Eclipse test systems can not detect ??
As an aside, I was recently tasked to visit an EU's premises as part of the e-Viper procedure. 8 Engineers previously, all PQT's good, hardly any errors in it's dormant state, or when the landline was rung, but DLM consistently dropped the profile day on day (Mentioned in another thread on here). By rigging up the HAWK to the MPF and constantly ringing the line, the tiniest of 'blips' (HR) was detected on the D-side cable [1]. A new pair was provided and I've not seen one single DLM event since then. Being on an 'e-Viper' means I'm absenced out of the system, and time constraints are not really an issue, without getting silly of course.
So, there we have it, an eclectic mix of getting the right engineer, with the right knowledge and the right tools, with the right amount of time given to fix it. If I were you, I'd put an extra quid on the 'Lotto'.
[1] This technique will not work on the JDSU, as it 'sees' ringing voltage as 'High Voltage Detected' and you can't see the screen for the warning !!
