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The Endeavour space shuttle will not take off on Monday, NASA officials announced, after the launch was postponed Friday due to a faulty heater system. And it looks like repairs on the system won't be finished for several days, pushing the launch back to the end of the week, if not further. A NASA spokesman said technicians and engineers will replace a switchbox in the Endeavour's engine compartment, which requires two days of testing before approval. No official launch date has been set.