Dpf help isx 2015 with cummins

[milekam]

I'm having so many problems with my dpf system $4000.00 later two months. I need a mechanic to help do the egr tuneup. I'm not that mechanically incline. I have got the filters cleaned, dpf box looked at, changed the dpf pressure sensor and got the doser valve and piping on the egr fixed. I keep having code spn 3720 15- particulate trap ash load percent least severe level. Any mechanics in the south? Or can anyone tell me how can I fix this problem? Thank you