If the server is still working, are you able to query the server using ldapsearch?
ldapsearch -H "ldap://localhost:389" -D "cn=tidal,ou=People,dc=example,dc=com" -W -x -b "dc=example,dc=com" "(&(objectClass=person)(uid=tidal))"
This example would search within your user entries to retrieve the information of a person entry with the UID of 'tidal'.
The problem with this is that you will likely need to bind to the server by providing your DN (distinguished name). An anonymous bind may be worth a try, though (to do this, you would drop the -D and -W switches). The base DN to search in will probably be much easier to intuit. How much documentation did the previous person leave behind? Alternately, is there an interface in place like LDAP Account Manager that would let you get an idea of the directory structure?
Do you know which variety of LDAP server you are running?