Without any documentation I have no way to know what validity there is to the whistleblower complaint. It's got to run thousands to tens of thousands of pages of inspection results, as-installed shims vs. ideal sized shims; what engineering studies may have done; what calculations may have been performed; what testing may have done. On second thought - hundreds of thousands of pages.
But I have every confidence that no one in Congress looking at this problem will do more than play to the crowd and the usual "demand answers."