Requesting advice from the A\C guru's on here

[X5chemist]

What are pressure readings? Even good shops don't replace valve core stems. Why not? Because the hoses connected. I've been burned on a few systems where valve cores leaked after disconnecting hoses. Even if they didn't show signs of leaks. It's the weakest point on a A/C stem. Remove the caps. Check for oil slight pressure swish when the cap is removed. It it worked, I would suspect a leak somewhere.