@Richard re risk
"it was grounded, and they had to use another plane, so there was a risk of lives being put at risk."
What planet are you from? Or are you a Boeing employee? It was grounded to REDUCE the risk not to increase it?
"whether its the pump, relay, part of a relay...who cares, it ALL should work perfectly on a brand new plane." Again I ask, what planet are you from? What is special about the plane being "NEW"? You think old planes should have more failures then new ones?
And what do you mean "should work perfectly"? Nothing is perfect. And the more complex it is, the less perfect it must be.
Instead of jumping up and down and panicing hysterically, increasing your risk of heart attack and/or being thought of as a fool, why not use your brain and think intellegently about risk.
What is the risk of failure, what is the cost of such a failure, what is the cost of reducing that risk. What is the 'acceptable' level?