I tried to move the horizontal stepper motors of the IP stage in order to center the Preisolator, but the network of the PI steppermotor driver did not work. And it turned out to be that the circuit board was damaged and burned out, probably because of water (maybe from May-June?).

So I borrowed the PI steppermotor driver from SR3 and I have reconfigured the IP address. (10.68.150.56  ----> 10.68.150.52) to keep the same group of address for the BS. The IP address list can be found here: http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/DGS/Projects/StepperMotor

I also opened the chassis and checked circuit boards of the GAS steppermotor driver, the TM satellite amplifier and BF picomotor driver of the BS and they are all fine.