For future reference if someone else ever has a similar issue. Was having a issue where my CEL light would flash on and off intermittenly. Sometimes it would stay on solid for a few minutes but would then go off. Could turn tractor off and back on and would stay off for awhile again, and then start flashing on and off. Called dealer and they came out to diagnose. The codes being thrown indicated a bad DPF sensor (maybe DPF pressure sensor). Tech did some voltage testing and found that the sensor wasn't getting the expected 5 volts. He took off the ECU wiring harness where I guess the sensor connects to, sprayed some cleaner on the pins and reseated; sensor was then getting the correct volts. So appears issue was just a loose ECU wiring harness. Thanks!
-Craig
-Craig