Purge air actuator code 3225, spn 3490 and an air dryer

[Meanwhile]

A couple weeks ago I headed out to load, about 3 miles down the road the check engine light came on. I turned around and went back to our yard. Insite told me it was Dpf purge air actuator 3225 and spl #3490. One of the guys in the shop came out to see what was going on and we both started looking for information on the codes. A few minutes later he found the actuator on the motor and unplugged the airline to it, there was no air. At the air dryer port there was nothing coming out either. He blew some shop air through the line to make sure it wasn't plugged and came to the conclusion it was more than likely the air dryer and that was the problem. The aux ports were plugging up with junk and not letting enough pressure through. With the new dryer on, the engine runs much different, it's smoother and I can hear the turbo more often than I had in the past. I wonder now if the low air pressure had an effect on other engine components to not function properly.