"by page"  RESTORE  of  an  ABM  (area  bitmap  page)  page  was
  attempted

  Explanation:  ABM pages are not backed up, so they  can  not  be
  restored.   The  affected page has been initialized, but the ABM
  chain must be rebuilt to complete the correction of the  corrupt
  ABM page.

  User Action:  Correct ABM pages by using the  ABM  qualifier  of
  the RMU Repair command.  You can do this now.