Amber Exclamation Point "Action Lamp" - what does it mean?

I have a new-to-me 2014 D4K2. On my first day with the machine about 4 hours into using it the Action Lamp came on. There was no other light on and the machine didn't seem to be operating any differently. I stopped immediately but let the machine idle for about five minutes thinking that maybe something was getting close to over heating. All the gauges were in the green but I didn't want to shut it down while hot.

I checked the engine oil, coolant, and hydraulic levels - all good....

Amber Exclamation Point "Action Lamp" - what does it mean?

Amber Exclamation Point "Action Lamp" - what does it mean?