1.   Controllers were also watching a slightly lower than expected flow of freon in one of two systems that cool the shuttle through tubing in its open payload bay doors.

2.   Engineers on Friday were analyzing a problem in one of two critical coolant loops for the payload bay doors.

3.   Once in orbit, the craft will open its payload bay doors and its cargo satellite will slide out to be released in orbit.

4.   The shuttle Endeavour suffered damage to its left payload bay door during weekend preparations in Florida.