s/(bad length # -{0,1}\d+ for ag. 0, should be) (\d+)/\1 LENGTH/;
s/(bad agbno) (\d+)/\1 AGBNO/g;
s/(max =) (\d+)/\1 MAX/g;
+s/(bad levels) (\d+) (for [a-z]* root, agno) (\d+)/\1 LEVELS \3 AGNO/;
# for root inos
s/(on inode) (\d+)/\1 INO/g;
s/(imap claims a free inode) (\d+)/\1 INO/;