Performed ac diagnostic, found system wasn’t working again because of the moisture switch in pan. After I got the system up and running and tested, found pan dry... could be bad switch moved location. Ran system for good amount of time. Then performed furnace tune up. System fired right up. Ran system thru it’s stages. System running ok at this time. Cleaned burners and flame sensor. Variable speed blower motor ok. Electrical looks good. Ducts in attic are silver flex sealed. Checked filter ok for now will most likely need to be replaced next visit. Heater working well at this time. Want to watch out for rodents. See if it gets worse.