Just to add fuel, I've had one captain in maybe 100 say, " you're part of the crew if you see anything don't just sit there." I think that sets a good tone. As a B6 guy I've had AA guys new to the bus both look back at me at the same time when an ECAM message pops up though
I'd probably approach it the same way I'd do with one of my fellow pilots... did you still want the speed brakes out? (Message flashing, dirty, powering up...) Toss out the old calm, casual, professional inquiry. I had some trouble with the GS here before...does that PAPI look off to you? I need to get something out there. If only for the CVR. And the fact that I have a safety role on the pilot side and am on a first name basis with an NTSB board member complicates it.