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George Diller/STS-134 Launch Commentator: This is Shuttle Launch Control.

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Our NASA Launch Director Mike Leinbach has made the decision, based on input from the engineering community,

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that we're not able to resolve this situation with the APU heaters in time to make a launch attempt today.

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There's not a way to do the kind of troubleshooting that we need to do and still be able to stay in a countdown configuration.

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So, we will be scrubbing for today, right now.

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It will be at least a 48-hour scrub turnaround while we try to get a better handle on what will be necessary to

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understand better what the problem is and as we have been able to piece it together,

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there will be some entry into the aft necessary to do that kind of troubleshooting.

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But in any event because of this problem with two failed APU heaters in APU No.

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1 and not able to find a satisfactory workaround or to understand what

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the problem is that's caused these two heaters to fail,

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the decision was made and concurred by Houston Flight that we will scrub for today.

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We will put together a trouble-shooting plan.