I have a 2013 Paystar that has the Maxxforce 13, it derated with the codes Spn 3055 fmi 0, and 3055 fmi 15. Checked the ground wires Infront of the starter, changed high pressure pump, checked for air in fuel, blew air threw the return lines. Nothing has worked, still getting the same codes after it warms up and truck loses power. I'm starting to lean toward maybe the fpr valve but looking for any suggestions. Thank you in advance!