Does anyone know what the most common reason why and where A/C refridgerant would leak from? Im guessing its an o-ring somewhere, but im hoping someone has had the same problem and had it fixed. Here in Italy, it is expensive to get the a/c checked. Its about 200 euro to check and then to refill and change out o-rings usually comes around to be 1500 euro. Im just looking for the most common place to check or replace the o-ring.