We restarted the data acquisition process of the CEB-LEV1 (clean room) at 14:39 UTC checking the cable connections of the geophones.
Moreover, we tried to restart the process for the CEB-LEV2 without success. The problem would seem related to the microphone NN_CEB_INF_Z_224 (mac 0.36.119.86.239.237) which is in the air handling unit room.
I will contact the POLGRAW team to fix the problem.