Not sure if anyone has had a go at changing one of these little buggers, but unless you have flexible arms that can dislocate, trying to test it proved to be a major ass ache
But change it I did, after reading my 'trustworthy' Haynes manual, with its extremely vague description of its location, I found it and changed it. For anyone that is interested, if you remove the front nearside wheel, and the associated engine splashguard (3 bolts), you will see the switch and lead, at the back
of the gearbox, not the top as described, but sort of middle........... if you get my drift!! Just wish the manual was more accurate. A little oil does come out when the switch is removed, but not great shakes, and fairly easy to top back up, if you have a long enough flexible hose on your bottle of gear oil.
And if someone has posted this before.......... I couldn't find it, so there!!