How do I access my device log?

I have an XB7 Rev 10 from Comcast. I'd like to know how to access its log. I can't seem to find it in the Xfinity Mobile app on my phone and I can't log into the modem's own 10.0.0.1 page because I don't know what my admin login is. This was never given to me when I received the device.

Thanks very much.