Damaged Borgs.

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Rather than that, it seems like borg damage is in some weird limbo state where it's neither there nor not there - after taking some damage, borgs will sometimes have damage visible on examination (dents, sparking wires, etc), but they'll show up in the status window and the docking station as undamaged, and attempts to repair them fail. It doesn't always happen, and I'm not sure exactly what goes into reproducing it.