Me again🙄
Right, the rear sensor was pretty much seized. The switch itself and the alloy dog bone linkage.
I replaced it with what appears to be a good used unit.
I replaced the alloy dog bone linkage on the front sensor. I found a seller on eBay who supplies OEM linkages. They are not cheap, at about a third of the price of a new switch from eBay, but they are good.
Anyhow, do I need to do anything to reintialise the system in any way, or should it all just work…?
Again, thank you for your time.