How do I see a SAML response?

I upgraded our virtual F5 to v11.5 this afternoon and straight after the reboot the access policy started working as expected.

The saml token is being validated, pulled apart and stored in session variables, and now the access_acl_allowed event is triggering and the request is allowed to continue through to the server!

Might be an issue in v11.3???

Thanks everyone for your help and suggestions.