1.   A shutdown following the ignition would likely have required technicians to replace all three shuttle engines, an operation that takes at least a month.

2.   Early detection of hairline cracks, for example, would enable technicians to replace crucial parts long before lives are endangered or there is expensive damage.

3.   Meanwhile, technicians were also replacing a malfunctioning computer, one of five primary units on Columbia.

4.   Over the weekend, ground technicians replaced a sluggish propellant system valve on the shuttle, clearing one of the issues.

5.   The origin of the hydraulic problem was traced to work done last weekend, when technicians replaced a leaky rocket engine valve aboard Columbia.

6.   Working at the launch pad, technicians replaced the balky valve over the weekend.

7.   Air Force technicians on Sunday replaced civilian air traffic controllers, who were delaying flights to protest the outdated equipment they were forced to use.

8.   He said Gulf Air technicians were replacing the broken engine and passengers were switched to another Kuwait Airways plane that was diverted from Dubai to fly them to Kuwait.

9.   Technicians replaced a fitting on a helium gas line in the shuttle tail overnight.

10.   Technicians replaced the thermal insulation surrounding the Endeavour O-rings, located in nozzle joints.