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I will give you a slightly different perspective on going about replacing the AOS on an engine. I have done it twice, on two of the 996's I have owned. Granted, both of the times were on project cars, that needed to have an engine swap done anyway, but I was sooooo glad that the engine was out to replace the AOS and even associated hoses. While the engine was out, not only did I address the AOS, but I also was able to easily replace the water pump, thermostat, spark plugs, starter, misc sensors, alternator, belt, RMS, and the coolant reservoir. Had either of them been a 6 speed, I would have done the clutch at the same time. I was also able to check for any leaks and address them at the same time. It was also a good time to clean the engine, which will help with any future leak identification.
If you aren't worried about all those other items I mentioned, or if the car has low enough miles that it isn't an issue, then just address the AOS.
I guess what I am saying, is that if the AOS is bad, the car might have enough miles on it to just drop the engine, and make sure you can address as much of the stuff at once, without having to pay for duplicate labor and have peace of mind knowing that it is ready to rock for another 50,000 to 100,000 with those items changed.
I also realize that I saved a ton on labor costs doing it myself, and that allows me the flexibility to buy my own parts and take my time. A luxury not everyone has.
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