Customer turned the system. Checked the condenser, both the condenser fan and compressor were running. The compressor was drawing 13.7 amps and rated for 19.2 amps. Checked the pressures. 41/255 psi. The suction temp was 77*. Checked the evap coil. 1/2 - 3/4 of the coil was frosting over. There is a freeze protection clipped to the suction line outside of the air handler. With the difference in pressures and coil frosting, it indicates that there is a restriction. The system is R22, recommend replacing the system vs replacing the evap coil.