I searched the web but could not find an answer. Today, I bought a Sony Ultra 3x remote at Target for about $12 and can control the Comcast Digital Box, my Samsung TV and a SONY 570 Blu-ray. Well worth the investment and if it doesn't work, you can always take it back.
Have you tried looking on the manufacturer's web site? I have looked on other sites for others and most manufacturers admit that there are so many new models out that the makers of the remotes can't always keep up. The maker of your Blu-Ray may list newer codes on their product support pages.
I have a Sony BDP-S360 and crossed fingers hoping that one of the Sony DVD player codes would work to assign it to the AUX button, but all failed. Anyone using any Blu-ray player linked to the Comcast remote AUX button?