Preventative maintenence inspection on 2018 Lennox airhandler. Inspection of blower, electrical and coil compartments. Inspected for loose or damaged wiring. Unable to remove air filter that fell into the return box without taking apart the coil or ductwork. This will not damage anything so it is not necessary to remove it. Current air filter is in new condition. Test ran in electric strip heat. All strips are operating properly and within specs. Test ran operation of heat pump heating. System is operating within specs. Blower motor is operating properly. All systems tested are operating properly, efficiently and ready for Winter.