EE WAS ASSISTING A SERVICE REP TO INSTALL A NEW WEAR LINER INSIDE A SECONDARY SCREEN. AS EE WAS LYING ON HIS STOMACH ON THE SCREEN DECK HE WAS HELPING TO PUSH THE LINER APPROX 2' INTO POSITION . EE REPORTED ON 4/8/02 HE HAD STRAINED HIS LEFT SIDE GROIN. HE WAS DIAGNOSED ON 4/8/02 WITH 3 HERNIAS. EE BEGAN LOSING TIME ON 4/10/02.