NEW : That resulted from damage being found in a valve on the shuttle Endeavour during its November 2008 flight . Repairs to leaky hydrogen gas supply line went well , NASA says . NASA hopes launch , scrubbed this week , will occur Sunday morning . Shuttle launch delayed , because of leak in a venting system . Shuttle to deliver cargo to the International Space Station .
NEW : Repairs to leaky hydrogen gas supply line went well , NASA says . NASA hopes launch , scrubbed this week , will occur Sunday morning . Shuttle launch delayed , because of leak in a venting system . Shuttle to deliver cargo to the International Space Station .