Log Locations
Common Log Locations:
Apache
Domain access logs: /usr/local/apache/domlogs/<DOMAIN>
Site and service error logs: /usr/local/apache/logs/error_log
SuExec audit log: /usr/local/apache/logs/suexec_log
SuPHP audit log: /usr/local/apache/logs/suphp_log
cPanel
Exim
System
Cron: /var/log/cron
Most other logs: /var/log/messages