refrigerant lines that connect indoor unit to outdoor unit will be installed with line set cover. in this process we will have to recover / pump down refrigerant, install new lineset with lineset cover, pressure test system verify no leaks exist, vacuum system to manufacturers recommendations of below 550 µm, release / recharge system to manufacture specifications with R410 a refrigerant. This repair is on an educated guess without doing the proper diagnostic an isolation pressure test there could be other repairs that may be needed.