Advanced Dial Help!

Hello!

I have a project that uses a dial that is set to 360 with 10 values. There are layers for each of these values. However, on these layers is a hotspot that takes the user to a specific report that is its own scene. At the end of the scene, it takes you back to the dial so you can see the other reports. What I am trying to do is have the value color (in this instance a circle) change color when the user has viewed the report, so they can tell which reports they have already seen versus what they haven't. I am having a hard time figuring out the trigger to set to make this happen. I can get it to change color but not the way I need it to. I cannot find any videos that tackle this specifically.  Does anyone out there have any ideas?

Thanks!