There are no storage requirements, they can get hot or cold with no penalty.
As for mystery degradation, being left outside or in water will damage them, as will all things that can generally damgage items such as falling rubble from roof collapse and pawns attacking them while in a break state (or setting fire to them). I belive they can also be hit by stray shots if combat occurs in the same room as they are stockpiled in but someone will need to correct me if thats wrong.
As for damage and surgery I've not seen any issues with using damaged organs or implants, implanting them seems to magically repair them.
I've seen 100% health implants be destroyed by botched surgery, it was my understanding that a failure destroys the part regardless of its integrity. But i may be wrong on that too.
As for mystery degradation, being left outside or in water will damage them, as will all things that can generally damgage items such as falling rubble from roof collapse and pawns attacking them while in a break state (or setting fire to them). I belive they can also be hit by stray shots if combat occurs in the same room as they are stockpiled in but someone will need to correct me if thats wrong.
As for damage and surgery I've not seen any issues with using damaged organs or implants, implanting them seems to magically repair them.
I've seen 100% health implants be destroyed by botched surgery, it was my understanding that a failure destroys the part regardless of its integrity. But i may be wrong on that too.