Blue SPP fall furnace tune up on RUUD split system with 80% gas furnace. Spoke with nanny, and no issues were known to be present since Heat was turned in recently. Talked about how when a furnace first starts up it is normal to smell a burning dust smell as any residual dust that has collected on the heat exchangers gets burned off. Changed filters included with blue spp. cleaned blower cabinet, checked blower capacitor and checked heat exchanger from below. Checked evap coil, drains and heat exchanger from above. No visible cracks noticed in heat exchangers at this time. Checked draft motor and cycled system on. Checked CO levels at 0ppm. Checked gas pressure, heat rise and amp draws. System working within specifications at this time!