good evening all
dear all where i can find the system logs in AIX 5.3
The default is the output of the command errpt. There is several switches with filters etc. for it. Check the man page for it.
There is also the syslogd running and it's config file /etc/syslog.conf determines, where messages go to. Per default, that config is just full of remarked lines. Otherwise check the lines being not commented out.