I wonder how the incident was diagnosed? Does the FDR record low level errors that might've contributed to this? I thought that it only recorded certain input parameters and high-level flight metrics but I'm no expert.

If a radiation event caused some bit-flip, how would you realize that's what triggered an error? Or maybe the FDR does record when certain things go wrong? I'm thinking like, voting errors of the main flight computers?

Anyway, would be very interested to know!