Sam J - arrived to service a Silver Club members fall tuneup on a horizontal heat pump in the attic. Spoke with customer, and they have been gone all winter, but wanted to perform the service. He advised me that they were unaware of any ducting/airflow issues. I replaced the air filters in the to return air grills, both are 20 x 20 x 1. Tested the thermostat operation in heat and began service. Rinsed off the condensing units coil and checked the capacitor for the fan motor and the compressor. Powered up unit and recorded start up amperage of the compressor as well as the fan motor. Then checked the run load amps of both compressor and fan motor. Moved to the attic to service the air handler. I began by checking the amp draw on the fan motor and the heat strips, both are within range. Checked the capacitor for the blower motor which was good. Drain line and pan are clean, pan treatment still effective. Move back to the outdoor unit and attach my gauges to check pressure and