VMS Help  —  RMU72  RMU_ERRORS, MBZFRESPC
  page <num> should contain <num> byte(s) of free space
  starting at offset <num>

  Explanation:  The page contains a  free  space  that  should  be
  zero, but is not.

  User Action:  Correct the error with the RMU Restore command and
  verify the database again.
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