Well that's suck. Reading between the lines a little. 0) Wire faults happen, stuff breaks, that isn't fixable. No problem. 0.5) A cable fault that can take

Well that's suck. Reading between the lines a little. 0) Wire faults happen, stuff breaks, that isn't fixable. No problem. 0.5) A cable fault that can take out your redundant pair of substations... means you do not have a redundant pair of substations. (sometimes you have to go to war with the army you have, not the army you'd want). 1) Faulty generator fan? a) Was this generator periodically run with a dummy load? { okay maybe a chicken fell in the fan or a weasel ate some control wires or something... } 2) The power circuits were never tested after a breaker got installed/reconfigured, and manual validation of configuration failed to find a discrepancy between plan and as build. 3) some back end parts of the EBS are probably A/B pairs and subject to split brain issues. This is why you always need to test what you run, and run what you test... Kudos for the write up. I see lots of electrician overtime in the near future.