Preformed heating maintenance on heat pump system. Confirmed filters were clean and thermostat is working properly. Checked electric heat and found working within specs41.4 Took amp draw on blower motor and found within spec .72 Found blower wheel clean and balanced. Evaporator coil is free of any debris and leak free. Found refrigerant levels within manufacturer specs using check chart 100/420 Took amp draw on condenser fan and found within specs .62 Found amp draw on the compressor within manufacturer specs 8.33 Contactor shows signs of pitting and arching. Capacitor is within recommended range. Confirmed the defrost cycle is working properly at this time.returned to service