Atlantis’ plumbing cracks have been welded but now NASA has found a problem with the crawler transporters that shuttle the shuttles between the assembly building and the launch pads. Broken bearings in this 37 year old equipment probably should not come as a surprise. Eight spare bearings are ready to go, but they may have to gather parts from both transporters to create one working one. Atlantis may launch Sept. 28 or Oct. 3.