DD15 fault code SPN 3246 FMI 0 DPF Outlet Temperature Very High

In this video, customer said the CHECK ENGINE LIGHT, MALFUNCTION LIGHT AND THE STOP ENGINE LIGHT came on when trying to do a parked regen.
Once I connected to the truck using my DDDL software I was able to see fault code SPN 3246 FMI 0 which is DPF Outlet Temperature Very High.
It is important to try and duplicate the problem first before removing the DPF filters and sending them out for service.
Once the parked regen was started, within 10 minutes the DPF outlet temp went above 1200 degrees (1248) and the STOP ENGINE LIGHT was illuminated. This is a protection feature to protect and prevent and damage to the One Box or to the truck.
I also performed a ISB test to see if any of the injectors could be causing the issue, valve adjustment was performed back in October of 2020 (around 40,000 miles ago).
Replacement of the DPF Outlet temp sensor was done, also checked the Diesel Doser Injector (doser valve). This is also important to check in case it is getting stuck in the open position, since the doser injector or doser valve did get stuck once shop air was blown into it. I used a test doser injector to perform the next step and that is to perform a parked regen in order to verify repairs. Normal regen time is approximately 30-40 minutes depending on how clean or dirty the after treatment maybe.
After approximately 30 minutes the parked regen was successful, the DOC inlet, DOC outlet and the DPF outlet temperatures were GOOD. The fault did NOT return and the truck was ready to be released.
There are a few things that can cause this fault code, dirty DPF filters, plugged DOC or DPF filters, over fueling injectors, a bad Diesel Doser Block to name a few.