Checked manifold gauge pressure to transducer on computer board. It was pretty close. With the system running low pressure was 65 psi so I figured there might be a leak somewhere. Found bolt on TXV to be leaking at the compression nuts. Try to tighten them still with leak. Open up the nuts and found that there was no gasket. Installed the gasket tightened up compression fittings. Pressurize the system 200 psi performed a tightness test. After a 10 minute hold I had zero leakage. Pull vacuum to 500 µm held five minutes. Redid the drain and the drain trap as the company that installed it used to running trap. Started up system added refrigerant. 8 1/2 pounds. 128/272. 10sh. 8sc. Delta T 22°.