The PLC2 process on h1ecatc1 got stopped again [1] and because of it the MC servo board was unable to control, resulting in trouble with the IMC locking.

 I did the same recovery procedure as I did before and it came back OK. The settings of the MC servo board was burtrestored to 11pm of yesterday. However we lost the settings of the delay line phase rotator (which is used to adjust the demodulation phase of the IMC PDH signal at 24 MHz) as there is no snapshot file prepared for it yet.
 At the moment it is unclear to me when the process stopped and why it happened.

[1] LHO alog #5021