Although NASA still cannot replicate the fuel sensor error that scrubbed Discovery's launch last week, a new launch date has been set for Tuesday, July 26th at 10:39 AM.
Shuttle program manager Bill Parsons said, of the sensor issue, "When we've done everything we can, and we've eliminated the most probable causes ... we believe the best way to do this is to do a countdown...If we get a signature [to the sensor failure] that we understand, then we take an exception."
Translation: Since we haven't found the problem, the best way to find the problem is to attempt a launch. If the fuel sensor fails again, then we'll call off the launch.