During phase 1, fsck(1M) found more than 10 duplicate (previously claimed) blocks associated with the specified inode number.
With this many duplicate blocks, it might be preferable to restore the file system from backup tapes.
For more information on blocks, see the section on checking file system integrity in the System Administration Guide, Volume 1. If you are using AnswerBook online documentation, "bad blocks" is a good search string.