Customer stated all was well with regards to normal unit operation. I started by changing the air filters on on both units. Blower motor amps were within range. Treated drain lines to prevent future blockages. Measured a 18 ° split on both units. Upon opening up the upstairs unit, I began to smell gas. After further inspection, I found the gas valve to be letting gas out of the orifices. Continuing to the outdoor units, both capacitors were testing within range, however, both contactors were testing high, but within range. Notified customer That these will need to be replaced in time, but it is not urgent at the moment. I wash both condensers to promote heat exchange and prolong the life of the unit. Both units in good working order upon departure. I also shut off the gas to the upstairs unit to prevent further leaking.