A Concorde runs over a bit of metal off of a DC10 and the fleet is grounded, even though it has been flying for over 25 years with no loss of life and tyre vulnerability to debris a known Achilles Heel.
This is not really a good example ! No loss of life doesn't mean the aircraft is safe. AF and BA did operate this machine for years knowing its extremely bad records and numerous tires accidents (including many fuel tanks perforations), all with the blessing of the authorities...
It's wonderful to know 777s are still flying while the officials just cleared the crew (otherwise what's the point of the medals ?). It's good to know that medals can improve 777's operational safety on similar issues.