I am an engineer without aerospace experience. However, In my experience, when several identical valves fail in the same service enviromment, you have made a de

I am an engineer without aerospace experience. However, In my experience, when several identical valves fail in the same service enviromment, you have made a design mistake. Valves with packing leaks make it a sophomoric design error. Yet, this craft was ready to launch. What else might wrong with it?