Triple redundancy on the triple-7?
I'm SLF but I did development work on some avionics a long while back. I do maintain a keen professional interest on how technical systems fail.
A colleague was ex-Airbus and working on the 320. Like the triple-7 they had triple redundancy on all flight critical systems, however they used at least two completely different types of computer with programs developed by different teams isolated from each other. It meant that the software 'flew' the plane interpreting the pilots instructions according to a spec. If hardware or software failed, then it would be ignored and the remaining 'good' systems would continue.
My question is that the 777-300 also has such systems, was Boeing also so cautious not to replicate a possible technical problem three times?