Thank you. I changed the prepare_cached to:

$sth_back = $db->prepare_cached("
   SELECT OID, EDIT_ID FROM AG_EDITORIAL WHERE OID = ? 
   AND EDIT_ID = ? AND OID NOT IN 
   (SELECT OID FROM AG_EDIT_RELD_EDIT WHERE OID NOT IN 
    (SELECT OID FROM AG_EDITORIAL)
   )
") or print STDOUT "Query: Checking For Backwards - Part 2 Links Faile
+d";

$sth_back->execute($all_rows_r->[0], $all_rows_r->[1]);
[download]

...and everything worked beautifully!