Performed preventative maintenance for a high efficiency Lennox furnace model #EL296UH090XV36C-06, serial #1718K02392. Upon arrival I called for heat and observed the system starting normally. I took a combustion analysis test and received the following readings, o2 is 15.1% and the co levels are 8ppm. I removed the access panels and took an amp draw for the inducer motor a received a reading of .26 and the blower motor amp draw is 5.76. I powered the system down and removed and cleaned carbon off of the flame sensor. Cleaned out the burners and burner box. Checked the pressure switch for clogs and tested the drain line and condensate pump with several bottles of water to ensure that there are no leaks or clogs. The homeowner will replace the air filter once it is delivered. Checked all electrical connections to ensure that they are secure and in good condition. Performed humidifier service for a Aprilaire 700 series humidifier. Removed and replaced the old #35 water panel and cleaned