I guess I should have added that in the end I needed a whole new shifter assembly myself. In my case I broke a pin on the assembly trying to clean it before I could even test it after I cleaned all the other harnesses as well. Best price I could find at the time was LandRoverMerriamParts.com
The assembly also came with the entire shifter cable even though it did not explicitly say that it did. When I went to do this I needed my LR3 the next day and I quickly realized that I could not be 100% sure if the cable actually came off the shifter assembly or not. I tried with some force but could not pop it off the new assembly and there is little room to even see how the old one is attached as it will only stretch a few inches away from where it is bolted in.
I had seen a part for just the cable, so I assumed that it did come off, but I was too nervous that I would break the new assembly trying to find out, so I ended up getting underneath and removing the entire shifter cable with the shifter level assembly. A lot more work than I had anticipated as I decided to start at 9pm at night in my garage thinking it would be a 20 minute swap! FYI, the cable "plug" twists clockwise to come out - you can see the notches in the photos below.
Once I had the old one out I felt free to use a little extra force and I was able to pop off the cable from the old assembly and see how it went together.
If you break your cable somehow I still have my old one which was fine (although a little dirty). I also opted to replace my shifter plate at the same time because I had another issue where the D light was always lit.
I tested the old plate with the new assembly and that issue went away, so it was not the plate itself that was causing it, but the shifter assembly board.
I swapped the plates anyway since I had the new one and my old one had a tiny scratch. The new one seemed a touch deeper orange in color (the PRND lights) than the other orange lights around console, but now I do not notice it.
Good luck!