"Grounded" is a loose term really........
Also could read:
Just happen not to be flying while we decide what's wrong (as we can't admit to there being a serious problem), then decide whether we can bodge something together to feasibly get them in the air whilst not have (too many) people believe that they should have been consigned to scrap a long time ago.
Oh, and who's door to lay it on should we have gotten the bodge wrong.