Yes - I checked the RC forums after I came to Xfinity. And a user on there had the solution - to protect his identity, I won't post his name here, but I'm not taking credit for this solution. If you need more info on this, I can give him proper credit in a private message.
The solution for anyone who has a universal remote that wants the IR codes for the XR11 remote:
Ensure you have JRE installed and running on your PC.
Install IR Scrutinzer
Click on the Generate Tab and use these settings:
Protocol: XMP-1
D: 62
S: 16
Use the Functions (attached Text file) in the F box, then click "Generate" > copy & paste into ProntoEdit.
You wouldn't need to do the Volume, Mute or Power options, as you'd use your TV codes.
Hope this helps others.