I did this:

$ find lib -type f -name \*.pm -print|xargs perl -pi.bak -e 's/return 
+OK/return OK()/'
[download]

(That was pretty fun.)

I'm still getting the same results. Thanks again for your suggestions.

P. S. — I did this to put it all back:

find lib -name \*.bak -print|perl -lne 'chomp;$f=$_;s/\.bak$//;print "
+mv -v $f $_"'|sh
[download]