OK, settign aside the slight iffyness of working on the wiring beyond the NTE, you might be over-thinking this.
The drop wire contains two colour-coded "pairs".
Each pair is two wires, which are what end up, eventually, at the A and B terminals on each NTE.
So, go back to the drop wire, and just follow each wire through to the A and B on each line - the colours may not be consistent, there may be wires connected to terminals that don't have to be, etc. You only need two wires on the back of an NTE - the LJU in the middle sounds like it's confusing matters.
Top tip - you will find approx. 50v across each "pair" - don't be a klutz and try and measure across pairs, and definitely don't use any sort of Megger-type device, a basic multimeter is all you need.
Have a look at http://www.telephonesuk.co.uk/wiring_info.htm
for info on colour codes and the like.