2005 Peterbilt 386 Engine problems

Tl*the contact owns a 2005 peterbilt 386. The contact stated that he felt as if he had been drugged whenever he awoke from sleeping in the vehicle. The following day, while driving approximately 70 mph, he became sleepy for no apparent reason. He purchased a tester to test the vehicle for nitric oxide and the levels read over 5,000 ppm. The company that the contact works for stated that they never heard of a semi-truck leaking nitric oxide. The manufacturer and dealer have not been notified. The cause of the failure has not been diagnosed properly. The current mileage was 485,037 and failure mileage was 435,000.