1. Apache Logs:
/usr/local/apache/logs/error_log
2. cPanel Logs
/usr/local/cpanel/logs/error_log
3. Exim Logs:
/var/log/exim_mainlog
4. FTP and Server logs
/var/log/messages
5. Cron logs:
/var/log/cron
6. Mysql Logs
/var/lib/mysql/hostname.err
Thanks.