I noticed a hissing sound and soon after the AC would not work. I took it in to the repair shop and they recharge the freon with dye. It work for about one week, and then the hissing sound came back. The repair shop identified it as a leak from the high pressure hose. GM part #22757062. The local dealership has none in stock and the part is back ordered. I am a GM employee, so I attempted to buy the part through our warehouse system and the part is out of stock and back ordered. I am wondering does this part have a high defect rate?