THE EE WAS ASSISTING COWORKER REPOSITION A PIECEOF STEEL FOR WELDING HE ATTEMPTED TO LIFT THE STEEL ONCE & FELT A STRAIN IN HIS LOWER BACK HE WAITED FOR A FEW MINS THEN LIFTED THE STEEL AGAI N. HE DID NOT SEEK MED ATTENTION UNTIL 3/6/00 ATWHICH TIME HE WAS REFERRED FOR AN MRI ON 3/8/00 AFTER REVIEWING THE RESULTS OF THE MRI, THE DR PLACED THE EE ON LIGHT DUTY DUE TO A MUSCLE STRA