2018 KENWORTH T680 Power Train Problems

We bought this truck with 401, 000 miles on it. So far we have had to replace the rear ends twice. the whole DPF system, the check engine light still on since the day we bought the truck. We have had 5 NOS sensors put into the truck, 6 input and output sensors put into the truck. This truck has been defective since the day of purchase. We keep having the same error code of p3770 come up evetime we take to shop. The error code has been looked at so many times that even the master techs don't know what is wrong with the truck other then we keep replacing the same stuff over and over again.

UNIT HAD CLUTCH FAILURE FAILED TO DISENGAGE UNDER 18E-102, PER FEDERAL GUIDLINES IT FALLS UNDER THE CLUTCH RANGE OF AU1704192065 AND FALLS UNDER EATONS ORIGINAL CAMPAIGN RELEASE BUT THEY REVISED IT TO WHERE IT DOES NOT COVER THIS ONE BECUASE NOW THEY CHANGED THE RANGE TO AU1711 THRU AU1804 BUT WE ARE SEEING A LOT OF FAILURE BELOW AU1711, WHY DOES EATONS DOCUMENT NOT MATCH THE FEDERAL DOCUMENTS? AND WHY ARE WE SEEING THESE CLUTCH FAILURES ON TRUCKS THAT WERE REVISED AND SAID TO NOW BE GOOD, BUT THEY ARE FAILING IN THE SAME MANNER