After the morning operations the DET_MAIN node was found stuck and unable to reach SHUTTER_CLOSED.

First we checked that the shutter was indeed closed by looking at the image of the camera B1s and increasing the integration time at maximum: no light was visible.

We noticed that the offset on the B1_PD3 photodiode was large (about 0.45 uW). Therefore we corrected it in the configuration of SDB2_dbox_bench (reloaded at 11h39 utc).

After the correction of the offset the standard state of DET_MAIN could be recovered by requesting the following states:

* FORCE_CHECK_CLOSED

* SHUTTER_CLOSED