Thanks Ifixit, I have checked for all the usual mechanical reasons; but the source seems to be the "saturated coil" message. The SP thinks it is "on the wire" even when it is not. We have 50 SP in the same area and this is the only one exhibiting this issue; so I doubt it is the transmitter (floor wire). I have changed out both sensor bars and am not receiving any fault/event codes associated with WGU except the 636.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.