I thought we had a no-fault culture in aerospace? So put the pilots on video and lets hear from them how their flight went. And yes that should include their thought processes when they wrote the tech log at the end of the flight. If there's commercial pressure to minimise technical issues, so keeping the frame in service, then that needs to exposed as well. From my reading this hidden hand of pressure on pilots to keep the show on the road regardless is all pervasive, and it takes a brave pilot to say "no, this needs to be remedied properly" rather than just sign off and go home "not my problem".
I'd guess in the US at least the crew would have filed an ASRS.
G