1ST CLEAN AND CHECK FOR 10 YR A/C UNIT. CHECK VOLTAGE AND AMPERAGE ON MOTORS. CLEAN AND CHECK CONDENSER COIL. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS. CHECK THERMOSTAT, AIRFLOW, AIR FILTER, FREON LEVELS, DRAINAGE, ENERGY .CONSUMPTION, COMPRESSOR DELAY SAFETY CONTROLS, AND ALL ELECTRICAL CONNECTIONS . EVERYTHING IS OK,