In LHO aLog 39484, it was reported that the WHAM6 Corner3 CPSs was sitting on a rail and it would intermittently come off the rail when the cables were messed with.  I managed to get the channels off the rail but V3 was clearly noisier than the others.

Yesterday, I worked the cables over to eliminate this and maybe succeeded.  The CPS cables are in the right turn port of the 5-way cross and one of the cables was looped back in the hidden turn and although it could not be seen, I suspect the copper shield was close to the BNC Bayonet and this was the source of the intermittence.  Pulling and twisting the cable un-kinked the loop and it looks like it should remain.  Difficulty here is that now that the feedthru is on the five way cross, there is no connection to break to aid in untwisting the run.  At least for the past 24 hours however it has remained stable.

The attached 10 day trend of the CPS locals shows the elevated noise of V3 and how all sensors have a similar noise level.  Also notice how the H3 signal has jumped onto the page during this work yesterday indicating that channel was also affected although it was not on the rail (32k cts.)  But, it was being influenced on the absolute level readout, that is, actual reported position.  When I trend this back to before the vent, the reading was never at this level and I think that the sensor must have been exposed to some erroneous signals which was giving a false position.  I will say that both channels are much better now!

Will update ticket 9477 to monitor these channels for a time before closing.