Some sites were showing a 403 on PHP pages. Attempted the following commands which have meant all sites now display the same things:
/usr/local/psa/admin/bin/httpdmng --reconfigure-all /usr/local/psa/bootstrapper/pp12.5.30-bootstrapper/bootstrapper.sh repair
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 On RewriteLog "/var/log/httpd/rewrite.log" RewriteLogLevel 9
Restart or reload apache web server.
/var/log/httpd/rewrite.logto find failed rule.