LDAP Backup?

My xserve G5 went down today and I cannot boot it up. I was on the phone with apple tech support and we diagnosed that it was a problem with the root user. Of course I didn't do any backup of the user database. My bad! We tried a few things to fix that issue with single user mode, but to no dice. I can access the Server HD via a PowerBook and Target Disk Mode, but cannot boot of the server HD this way. I made a disc image (via disk utility) of the entire Server HD (1) just so I wouldn't loose something important. What I need to know is how do I backup the LDAP database so I don't have to recreate the users and groups and such. I have about 190+ macs I manage and I don't want to re-add each computer and user back in. Any ideas?