Select Neutral Fault

Hi there i live in Bournemouth. I have just bought my first 1996 P38
Have a few problems with at the moment. The first is a select neutral and slow down.
It seems to be stuck in high gear. Some people said get your ECU tested. If that is correct which one?
Is it called the gearbox transfer ECU?
Could it be the transfer box motor? and is it an easy fix?
Thanks

Welcome to LZ. There should be someone along who can help (not me) or try posting in the Range Rover bit. Hope you have very deep pockets - you're going to need them owning a P38

Lubicate the cable and linkage, then give the box an oil change