EE WAS HELPING TO REPOSTION THE BELT TENSIONER STATIONARY ROLLER ASSEMBLY AFTER IT HAD BROKE LOOSE FROM ITS MOUNTING BEAMS. THE ASSEMBLY HAD BEEN STOOD UP AND THE CREW WAS GETTING READY TO REPOSITION ROPES TO MOVE ASSEMBLY INTO FINAL POSITION. EE IS BELIEVED TO HAVE WENT IN TO MOVE ROPES WHEN THE ASSEMBLY FELL OVER PINNING THEM.