Arrived for a routine. Furnace tuneup. Checked all electrical components, which were operating within. Manufacture specifications. Inducer motor looked healthy. And was pulling moderate amps. Gas combustion test was clear and temperature. Split looked good. Changed out both electrostatic filters and had them replaced. Blower wheel looks clean And other than surge protection, the system does not need any modification at this time. I did offer to install service protection however, the homeowner does not want to move forward at this time.