I just purchased a 2017 Titan XD 5.0 with 9,000 miles on it. When the salesman first brought the truck around, I could hear what sounded like a bad belt tensioner bearing. My purchase contract stated they would remedy this issue to my satisfaction. The tech stated there was a TSB for the AC clutch and replaced it. This did not fix the issue. Tech line asked that he remove the belt and briefly start the motor to eliminate the pulleys and accessories. The metallic grinding noise is still there. Tech line has now advised him to pull an oil sample to analyze for metal particles. They advised next step will be opening up the crankcase and timing chain cover. The oil analysis has not been completed yet. Has anyone else had a similar issue?