Maintenance completed, drain and flush condensation line, clean evaporator and condenser coil, check system operations, all systems vitals are good at this time, upon arrival client has concerns of system line set and drain line making a stain in the wall , conducted a visual inspection, drain line and line set are located on the outside wall , advised client the problem not appear caused by the line set , also recommended to remove the line set cover to verify what is the cause of the humidity problem in the wall, client decided not removed line set cover at this moment