Trickydick:
Earlier LFs has the sensor ring cast into the disc and it rotted badly until the sensor could not work out what was going on, later on they got a separate ring.
If you have a multimeter and a jack you can do some basic checks yourself.
Youtube will give you some pointers, I would say 1/2 an hr and you can have all the sensor outputs checked out at the wheel stations.
Half an hour with rotary wire brush, on each ring, should help, its tight but do-able…
Reads like a innuendo.!