I went push all the possible connectors for the MC3 shadow sensors including the SCSIs, flat cables and satellite box.
Also I put screws on them so that they won't become loose any more.
As a result UL_PDMON dropped from 0.6 V to 0.490 V and it becomes stable so far.
I didn't strain relief the cables but we must do it at some point before going into the full locking test.
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The attached plot shows the 30 day trend of the MC3 UL PD signal. The signal dropped to zero at some point but now it is close to the level it was a few weeks ago. There still could be a problem with the cable.
The rest of the MC1,2,3 PD signals looked ok.
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