EE WAS REPAIRING TOP ROLLERS ON 235C. HE HAD A CHAIN FROM BUCKET TO TRACK TO PICK UP TRACK SO HE COULD PUT ROLLER IN PLACE. THE CHAIN SLIPPED MASHING HIS FINGERS BETW3EN TRACK RAIL & TOP ROLLE R. HE DID NOT HAVE THE PROPER BLOCKS TO HOLD THE TRACK UP IF IT SLIPPED.