Greater customer upon arrival customer led me to the attic where the air handler is and also the thermostat to turn on the unit on cooling to see if the condenser run which it did went to the condenser popped off the top clean from the inside with water and chemical check voltage and amps. Everything was fine. I was not given a filter nor did the customer have one so filter was not changed. Checked pressure with field pieces and also temperature difference with temperature probes. Found a unit in the Attic open with two missing screws, put in to self tappers and close that shut. Customer was aware of every information everything was fine also checked out the supposedly missing insulation no insulation was missing.