use below at you own risk but have used many times with no issues
Change all permissions for folders from 777 to 755
find /home/*/public_html -type d -exec chmod 755 {} \;
Change all permissions for files from 666 to 644
find /home/*/public_html -type f -exec chmod 644 {} \;
Remove any php_value and php_flag entries in .htaccess files as they will produce an Internal Server Error if in an account's .htaccess
find /home -type f -name '.htaccess' -exec grep -Hrn 'php_value' '{}' \;
find /home -type f -name '.htaccess' -exec grep -Hrn 'php_flag' '{}' \;
after you find the php directive above either remove them or relocate them to the clients php.ini
after you have completed you can tail your Apache error_log
to see if there is anything else that may be out of wack
since your running mod_ruid2 no need to seach for nobody files
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and an even easier method is to switch CloudLinux & cageFS
and enable LSAPI and no need to switch anything