Unexpected errors during an audit are errors that do not relate directly to the purpose of the audit, which is to find and repair problems with DFSMShsm data sets and controls. For example, if the AUDIT function attempts to fix a problem and the command used to complete the fix fails, the AUDIT function provides you with an error message.
If such an error occurs, the AUDIT function writes a brief message to an output data set in the form of MSG 9xx. The AUDIT function will also write an informational message (MSG 998 or 999) to describe the AUDIT function running when the error occurs.
In addition, the DFSMShsm command activity log contains any associated ARCxxxxx messages that describe the actual problem.