Completed furnace, maintenance and inspection. I cleaned flame sensors and wiped down furnaces. I tested amp draws and components. I checked air pressure and temp splits. The air pressure on the upstairs unit is a little over the max. Main floor system air pressure is at 80% of max, which is what is recommended for the system. We talked about some possible solutions with the flex duct in the attic and duct cleaning. Both furnaces are operational at departure.