Nothing springs to mind. Looking at the craft, its fission reactor is out of fuel (though at 0/100, rather than NaN) and cooling, so that must have recently run out. I've not been paying it any attention, and that'll have happened during a time accelerated interplanetary transfer. I could probably load up an old save and compare, and run it forward; though if it's anything like software testing at work, nothing untoward will happen. Will do.