Today during the lock acquisition I have noticed that there was power on B1 PD1 while trying to lock the OMC.

Figure 1 shows fluctuation on B1 PD1 even though the voltage bias is off.

Pressing the close button of the shutter in vpm worked to close it, but before that I panicked and closed B1 PD3  and turned off its voltage bias instead. Which caused an unlock first as DET_MAIN has seen the B1 PD3 being turned off and put the interferometer in DOWN.

Maybe the B1 PD shutters are starting to be stuck again because the interferometer locks are becoming too long, and they are not open/closed often enough. We may need to add checks in the automation to check they are indeed closed.