Make all repairs necessary to restore the unit to full health and eliminate all other concerns. Installed new Honeywell zone board and 2 zone damper motors. Tested operation in heating and cooling modes. Ambient temperature of 66° had heat pump pressures a little high n heat mode. In cooling mode was able to get a better pressure readings. While inspecting system found a temperature difference before and after filter drier located in attic next to air handler. Mentioned findings and recommend replacement of filter drier and refrigerant. Sent estimate to homeowner, system is fully operational at time of service.