Dear be_lo!
If the HARD_BAD alarm is reported by a board, the possible causes are as follows:
Cause 1: The service board is not in good contact with the backplane, the version of the board is mismatched with the version of the NE, or the service board is faulty.
Cause 2: The cross-connect board is not in good contact with the backplane, or is faulty.
Cause 3: The SCC board is not in good contact with the backplane, or is faulty.
Cause 4: The power supply of the NE is abnormal.
For the processing method, please visit the following link:
https://support.huawei.com/hedex/hdx.do?docid=EDOC1000095052&id=alm_hard_bad&lang=en
Good luck!