https://spaceref.com/status-report/sts-135-update-thermal-protection-system-inspection-complete/
STS-135 Update: Thermal Protection System Inspection Complete - SpaceRef
Jul 9, 2011 - Space news and reference site.
thermal protection systemsts 135updateinspectioncomplete
https://spaceref.com/status-report/endeavours-thermal-protection-system-cleared/
Endeavour's Thermal Protection System Cleared - SpaceRef
May 27, 2011 - Space news and reference site.
thermal protection systemendeavourcleared