Orangebean wrote:

Here's what the early XYZ units look like, full of cr@p and opened up!

I can't imagine much contact cleaner will find its way into those microswitches if just squirted through the vent hole so think you were lucky there BrianH

It did get around half a can of it in there! Its been ok since, but i'm expecting it to play up again hence getting hold of a replacement

They aren't actually microswitches but plastic blocks with the contacts underneath them and a small plastic shuttle that bears on the indents in the quadrant at one end and the springy contacts at the other. So contact cleaner will find it's way there eventually. On the two non-working ones I've opened up, the moisture has got in the vent hole and rotted through the thin wires running from the terminals at the far right in the picture (where the wires are attached on the other side) and the tracks that run to the switch contacts. I've managed to dig enough of the plastic out to allow me to solder jumper wires in place of the rotted bits. Fiddly but with the cost of a new one, worth the effort. When that happens though one switch (X, Y or Z) stops working completely so the display makes no sense at all. I would suspect that if it is only Neutral that isn't showing, the Y switch shuttle or the quadrant track is worn so the Y switch isn't closing when in Neutral but it is working when needed in the other gears.