thanks much for your comment regarding ldap error.
I noticed mailbox.log is not available if I install ZCS following guidance from wiki (
Network Edition Disaster Recovery - Zimbra :: Wiki).
So I reinstall ZCS again with Admin guide, now I am able to see mailbox.log.
LDAP error seems to get cleared after I replace localconfig.xml, but now I faced new errors - logger & mailbox doesn't start when zmcontrol start.
It seems have been discussed in forums many times, hopefully will be able to find some solution.
thanks anyway.