F650 CUMMINS WITH SO MANY PROBLEMS....CAN I FIX THIS ONE?

IN THIS VIDEO I AM WORKING ON A TRUCK THAT BELONGS TO A FRIEND OF MINE. IT IS A 2011 FORD F650 WITH A 6.7 CUMMINS ENGINE AND ALLISON AUTOMATIC. HE BOUGHT THE TRUCK AND STOPPED BY ON HIS WAY HOME WITH IT ON HIS TRAILER. IT HAS MUTLIPLE ISSUES. LOTS OF EQUIPMENT WAS NOT WORKING. HAD A PILE OF FAULT CODES, IN DERATE MODE, DAMAGED WIRING ISSUES, POORLY INSTALLED AFTERMARKET RADIO AND IT CHEWED UP THE SERPENTINE BELT. HE ASKED IF I COULD PUT MY SCANNER ON IT AND GIVE HIM AN IDEA OF WHAT WAS GOING ON. AFTER A SOME CHECKS AND TESTS, HE UNLOADED THE TRUCK AND I STARTED LOOKING INTO IT. I DIDNT THINK I WOULD BE DIAGNOSING THESE ISSUES SO I DIDNT START RECORDING FROM THE BEGINING. SAD. IT WOULD HAVE MADE A GREAT VIDEO ABOUT HOW SOME PEOPLE DO MORE HARM THAN GOOD WHEN THEY START POKING INSULATION ON WIRES AND USING TEST EQUIPMENT IMPROPERLY. WE RECORDED WHAT WE COULD. HOPEFULLY IT WILL HELP SOMEONE ELSE WHO IS EXPERIENCING THE SAME PROBLEM.