EE WAS KNEELING DOWN, HELPING ANOTHER MECHANIC WORK ON A SERVICE TRUCK'S BRAKES. THEY WERE REMOVING THE TIRE TO WORK ON THE BRAKES. THEY WERE USING A DUAL WHEEL TIRE JACK AND THE CHAIN ON THE TIRE JACK SLIPPED. THE TIRE FELL ON HIS FOOT, BRUISING IT. HE WORKED RESTRICTED DUTY FOR THREE DAYS.