Some sites were showing a 403 on PHP pages. Attempted the following commands which have meant all sites now display the same things:
Invalid rewrite rules specified in domain
Enable rewrite rules debug in
/var/www/vhosts/system/domain.tld/conf/httpd.confby adding the section below:
RewriteEngine OnRewriteLog "/var/log/httpd/rewrite.log"RewriteLogLevel 9
Restart or reload apache web server.
/var/log/httpd/rewrite.logto find failed rule.