A leak was found last night whilst bringing the helium gas up to pressure. On examination there was some material found in a coupling thought to be fragments of an O ring.
Repairs to the coupling are undergoing at this time and although the repair is expected to take about 2 hours the pressurising of the tanks and lines will take about 16 hours. This delay will push the launch back at least 24 hours.
The new launch date is 2nd November 2010 at 20:12 GMT (4:12pm EDT). The weather conditions are predicted to be favourable for the launch with just a 30% chance of a violation. There are plenty of other opportunities to launch over the next week in case additional time is required.