EE STATED: HE AND A COWORKER WERE CHANGING OUT BELT STRUCTURE ROLLERS IN THE 3RD SOUTH BELT, WHEN ADRAGGING A ROLLER FROM THE SUPPLY ROAD THRU THE XCUT OVER TO THE BELT ENTRY, PAIN WAS EXPERIE NCED IN HIS MID/UPPER BACK. THE PAIN WORSENED THROUGHOUT THE SHIFT.