Endeavour's external tank will be tested.

[interstellaryeller]

On Wednesday, July 1, starting at 7 a.m. EDT, a tanking test will be conducted to ensure repairs were successful. Endeavour's external tank will be filled with liquid hydrogen and liquid oxygen, just as it is before launch. NASA managers will hold a news conference following the test to discuss the results at approximately 1 p.m. The test and news conference will be shown live on NASA television. You can get nasa tv @ http://www.nasa.gov/multimedia/nasatv/index.html