EE WAS ASSISTING IN THE REPLACEMENT OF THE CONVEYOR BELT ON THE NO. 3"" WEIGHT BELT. HE WAS REACHING UNDER THE STRUCTURE PULLING THE NEW BELT INTO PLACE WHEN HE EXPERIENCED SOME LOWER BACK PAIN S. ON 11-6-00 IT WAS LEARNED THAT EE WAS RECEIVING THERAPY TREATMENTS IN THE FORM OF MANIPULATI ONS FOR THIS INJURY.