Upon arrival customer showed location of thermostat and basement system. Filters at this time are OK explained the merv rating to customer. Found the blower motor operating properly at this time.coil is clean free of debris at this time no leaks detected inspected drain line which was operating properly. While in the basement inspected expansion tank which was full of water and is 19 years old provided options to adress this. Outdoor unit is clean free of debris electrical connections clean tight and secured. System charge is within manufacturer specifications at this time. At this time customer declined options return system to normal operation.