One system cooling maintenance in lilburn. Arrived on site, checked filter and cleared drain line, checked electrical connections, amp draw, capacitance, checked condenser coil and refrigerant pressures. Found system with only one form of water safty, evaporator coil is corroded and potentially leaking refrigerant, blower motor assembly is dirty, duel run capacitor is reading low and refrigerant pressures are low. Due to age and condition of system, I recommend replacing equipment at this time. Unit is operating at this time, but not to capacity.