Upon inspection found evaporator coil frozen over, and suction line. Inspected condenser and found leak at king valve on compressor. Recover refrigerant, install new king valve, nitro leak test, vacuum system, charge system to factory spec and test for proper operation. Arrived on site, checked in with mod Chris. Proceeded with the repairs, recovered refrigerant, install new king valve, nitrogen leak test, vacuum unit. Upon charging the unit noticed the compressors was making a hissing noise. My suction was getting warmer and my vapor saturation was high. Did more investigating and found that the compressor is not able to pump down and it bypasses hot gas to suction side. The valve on compressor are bad. Quoting all work to be done, let mod Chris know of my finding. Unit is running but not cooling properly.