Arrived to do a performance maintenance. Found a mouse nest inside the burner cabinet. Called around to track down the special bagged filters. With homeowners approval had a parts runner pick up the filters and bring them out. Set up for combustion analysis temperature split and static pressure tests. Verified operation of all mechanical and electronic components of the furnace. Checked blower for cleanliness and to see if there is any play in the bearings. Checked systems heat exchanger to ensure proper venting of flue gas. Performed an electronic gas leak search. Verified operation of the humidifier. With homeowners approval replaced the humidifier panel and replaced the bagged filter with a new one. Furnace and humidifier are operational at this time.