EE CHANGED THE MOTOR ON #5 TAILINGS LINE SAMPLER AFTER CHANGING THE MOTOR HE BROUGHT THE UNIT BACK TO THE SAMPLER. HE HAD TO BEND OVER AND SLIDE THE UNIT UP THE STAIRS ONE STAIR AT A TIME. HE FELT A PAIN IN HIS BACK. HE WAS EVALUATED BY A PHYSICIAN ON 3/19/02 AND WAS TAKEN OFF WORK.