[salawat]

It's not fixed until it is fixed.

I understand that with physical systems, the cost and complexity of detecting is higher, but if you're putting other people on the line, you damn well better do a live test of your vehicle before another living soul not certified as a pilot or flight engineer is allowed on board.

The more I read about this, the more it appears to me that excessive trust is placed on filed paperwork. Nothing says a fix is done like a successful test flight that specifically attempts to recreate the conditions surrounding the original failure.