1.   Liftoff was postponed after workers discovered a coolant line had been installed without thermal insulation.

2.   Ammonia leaked from a coolant line that Curbeam was trying to connect.

3.   Curbeam photographed coolant lines that leaked and sprayed him with ammonia during the first spacewalk on Saturday.

4.   Their work was interrupted briefly when ammonia leaked from a coolant line that Curbeam was trying to connect.