Kerberos client logs

Which files should I look for kerberos authentication log stuff in a
OSX 10.6 box setup as kerberos client? When I create the krb5.conf
file using kerberosautoconfig, it creates log files in
/var/log/krb5kdc but they are rather not useful at all (kinda makes
sense in a certain way since this is not a KDC). Best I found so far
is /var/log/secure.log