I got up nice an early this morning before the heat to change the NPS. Put the car up on stands and decided not to do the job. I don't have a short 19mm spanner and even if I did I think that I would need to drop the box, which is something I am not willing to do on my own on the garage floor. I will take it up to AMAuto when I get a chance.
Got to know what you can and cannot do.