I've been using the K-9 units rather extensively, trying to keep a pack of five of them around. This, however, inevitably leads to them being shot/stabbed/exploded and otherwise damaged. The thing is, I don't seem to be able to replace their legs with the ones made from the parts bench, nor do I see options for making/replacing things such as smell sensors, batteries (this may be a research thing) or voltage adapters.

So the question is, how exactly does one go about keeping them in shape, or am I consigned to having a bunch of half crippled robo dogs?