One of the trenches at launch pad 39A that channels flames away from the shuttle during lift-off was significantly damaged. The subsequent mishap investigation found that the damage was the result of carbonation of epoxy and corrosion of steel anchors which held the refractory bricks in place. These had been exacerbated by the fact that hydrochloric acid is an exhaust by-product of the solid rocket boosters. Repairs to the trench were completed before the STS-125 mission's then scheduled launch attempt on 8 October 2008. In fact STS-125 finally launched in May 2009, and in the meantime STS-126 (November 2008) and STS-119 (March 2009) had both been successfully launched from pad 39A.