Yesterday afternoon (~13.30UTC), we had to intervene again on the chiller system which takes care of the temperature of most of the PSL/INJ devices in laser lab. In particular, the most relevant is the neovan head, with its temperature that was growing up quite rapidly (see fig. 1). The intervention made on Oct. 22nd  could help on stabilize the temperature of the NEOVAN electronics (thanks to the TCS spare chiller) but wasn't as effective for the main chiller, since the head T started to increase again just after the intervention. 
The effet of this T increase is that the matching to the PMC worsen, reducing the transmitted power (with the P_amp almost stable). 

Thus, we plugged the spare OMI chiller with inverted flow, and we will keep it for some days, hoping it will eventually free the pipes from any possible obstacle. 
As a result (see fig. 2), the NEOVAN head temperature seems to be now much more stable than before. PMC_tra power also increased. 

To be noted that the measured flow is lower than before as the probe is now the end of the circuit (fig. 2).