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If the unit is bad, it will be bad right out of the box. I would not be afraid to install it, but test it afterwards (we use a digital manometer, but you can rig up one from a yardstick and some plastic tubing). On a cold start, you should see 4-7 inches of water vacuum, which should level out to 5 inches or water as the car warms up.
We test every car that comes through the shop, regardless of why it is here, and we automatically replace the AOS on any car that we pull the trans out of for whatever reason, particularly 996's.
There isn't a whole lot of rhyme or reason why these things are what they are, but I would bet on a new unit over one with nearly 100K on it.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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